diff --git a/changelog/unreleased/fix-ocm-weddav.md b/changelog/unreleased/fix-ocm-weddav.md
new file mode 100644
index 00000000000..c6769985d21
--- /dev/null
+++ b/changelog/unreleased/fix-ocm-weddav.md
@@ -0,0 +1,5 @@
+Bugfix: OCM Specification Compliance
+
+OCM Specification Compliance
+
+https://github.com/owncloud/ocis/pull/11773
diff --git a/go.mod b/go.mod
index cde997c5207..5b7445b35af 100644
--- a/go.mod
+++ b/go.mod
@@ -66,7 +66,7 @@ require (
 	github.com/open-policy-agent/opa v1.6.0
 	github.com/orcaman/concurrent-map v1.0.0
 	github.com/owncloud/libre-graph-api-go v1.0.5-0.20250217093259-fa3804be6c27
-	github.com/owncloud/reva/v2 v2.0.0-20251017104024-82c22e954c1c
+	github.com/owncloud/reva/v2 v2.0.0-20251106102926-751223b32d48
 	github.com/pkg/errors v0.9.1
 	github.com/pkg/xattr v0.4.12
 	github.com/prometheus/client_golang v1.23.2
@@ -335,7 +335,6 @@ require (
 	golang.org/x/sys v0.37.0 // indirect
 	golang.org/x/time v0.14.0 // indirect
 	golang.org/x/tools v0.37.0 // indirect
-	golang.org/x/tools/godoc v0.1.0-deprecated // indirect
 	google.golang.org/genproto v0.0.0-20250303144028-a0af3efb3deb // indirect
 	google.golang.org/genproto/googleapis/rpc v0.0.0-20250825161204-c5933d9347a5 // indirect
 	gopkg.in/cenkalti/backoff.v1 v1.1.0 // indirect
@@ -345,7 +344,7 @@ require (
 	sigs.k8s.io/yaml v1.5.0 // indirect
 )
 
-replace github.com/studio-b12/gowebdav => github.com/kobergj/gowebdav v0.0.0-20250102091030-aa65266db202
+replace github.com/studio-b12/gowebdav => github.com/kobergj/gowebdav v0.0.0-20251030165916-532350997dde
 
 replace github.com/egirna/icap-client => github.com/kobergj/icap-client v0.0.0-20250116172800-8eaa5022532b
 
diff --git a/go.sum b/go.sum
index c191d3bcfcf..458ec970ff5 100644
--- a/go.sum
+++ b/go.sum
@@ -578,8 +578,8 @@ github.com/klauspost/cpuid/v2 v2.2.11 h1:0OwqZRYI2rFrjS4kvkDnqJkKHdHaRnCm68/DY4O
 github.com/klauspost/cpuid/v2 v2.2.11/go.mod h1:hqwkgyIinND0mEev00jJYCxPNVRVXFQeu1XKlok6oO0=
 github.com/kobergj/go-micro/v4 v4.0.0-20250610135441-d0b187215699 h1:3TOdtI6WPyvBB+uCykapjRtQX8vTHMlyhINzR+58B4k=
 github.com/kobergj/go-micro/v4 v4.0.0-20250610135441-d0b187215699/go.mod h1:eE/tD53n3KbVrzrWxKLxdkGw45Fg1qaNLWjpJMvIUF4=
-github.com/kobergj/gowebdav v0.0.0-20250102091030-aa65266db202 h1:A1xJ2NKgiYFiaHiLl9B5yw/gUBACSs9crDykTS3GuQI=
-github.com/kobergj/gowebdav v0.0.0-20250102091030-aa65266db202/go.mod h1:bHA7t77X/QFExdeAnDzK6vKM34kEZAcE1OX4MfiwjkE=
+github.com/kobergj/gowebdav v0.0.0-20251030165916-532350997dde h1:HYcp4J4xYe2m9KSUVbTccJb14TpSs+ldCfDFgqsXedI=
+github.com/kobergj/gowebdav v0.0.0-20251030165916-532350997dde/go.mod h1:bHA7t77X/QFExdeAnDzK6vKM34kEZAcE1OX4MfiwjkE=
 github.com/kobergj/icap-client v0.0.0-20250116172800-8eaa5022532b h1:NBKEgFtIukCreWOEvtrgNQusqosGyhlxzyiHbba1zEI=
 github.com/kobergj/icap-client v0.0.0-20250116172800-8eaa5022532b/go.mod h1:HpntrRsQA6RKNXy2Nbr4kVj+NO3OYWpAQUVxeya+3sU=
 github.com/kobergj/plugins/v4/store/nats-js-kv v0.0.0-20240807130109-f62bb67e8c90 h1:pfI8Z5yavO6fU6vDGlWhZ4BgDlvj8c6xB7J57HfTPwA=
@@ -717,8 +717,8 @@ github.com/orcaman/concurrent-map v1.0.0 h1:I/2A2XPCb4IuQWcQhBhSwGfiuybl/J0ev9HD
 github.com/orcaman/concurrent-map v1.0.0/go.mod h1:Lu3tH6HLW3feq74c2GC+jIMS/K2CFcDWnWD9XkenwhI=
 github.com/owncloud/libre-graph-api-go v1.0.5-0.20250217093259-fa3804be6c27 h1:ID8s5lGBntmrlI6TbDAjTzRyHucn3bVM2wlW+HBplv4=
 github.com/owncloud/libre-graph-api-go v1.0.5-0.20250217093259-fa3804be6c27/go.mod h1:+gT+x62AS9u2Farh9wE2uYmgdvTg0MQgsSI62D+xoRg=
-github.com/owncloud/reva/v2 v2.0.0-20251017104024-82c22e954c1c h1:8xgW1qAuKNdXgH9P8F4hDI5vU6/VM1PibZhIFj7JSU0=
-github.com/owncloud/reva/v2 v2.0.0-20251017104024-82c22e954c1c/go.mod h1:EgvdLWO1ezgdVqewaAP2GIZJfRRggwZItJnnTBxNNrY=
+github.com/owncloud/reva/v2 v2.0.0-20251106102926-751223b32d48 h1:RGnvbZNOE1ss3b0BOM8J+bPrk6prfXB0paKnWaDA/Xg=
+github.com/owncloud/reva/v2 v2.0.0-20251106102926-751223b32d48/go.mod h1:XenQR69s8JQ5Q4/+/vQbSg6B4+0iM6inYjNxB7SJAhI=
 github.com/oxtoacart/bpool v0.0.0-20190530202638-03653db5a59c h1:rp5dCmg/yLR3mgFuSOe4oEnDDmGLROTvMragMUXpTQw=
 github.com/oxtoacart/bpool v0.0.0-20190530202638-03653db5a59c/go.mod h1:X07ZCGwUbLaax7L0S3Tw4hpejzu63ZrrQiUe6W0hcy0=
 github.com/pablodz/inotifywaitgo v0.0.9 h1:njquRbBU7fuwIe5rEvtaniVBjwWzcpdUVptSgzFqZsw=
diff --git a/services/graph/pkg/service/v0/utils.go b/services/graph/pkg/service/v0/utils.go
index 8f6fd92772d..a326a3bfbbc 100644
--- a/services/graph/pkg/service/v0/utils.go
+++ b/services/graph/pkg/service/v0/utils.go
@@ -6,6 +6,7 @@ import (
 	"encoding/json"
 	"io"
 	"net/http"
+	"path"
 	"reflect"
 
 	gateway "github.com/cs3org/go-cs3apis/cs3/gateway/v1beta1"
@@ -544,7 +545,7 @@ func cs3ReceivedOCMSharesToDriveItems(ctx context.Context,
 			// file shares
 			resOpaqueID := "/"
 			if receivedShares[0].GetResourceType() == storageprovider.ResourceType_RESOURCE_TYPE_FILE {
-				resOpaqueID += receivedShares[0].GetName()
+				resOpaqueID = path.Join(resOpaqueID, receivedShares[0].GetName())
 			}
 
 			shareStat, err := gatewayClient.Stat(ctx, &storageprovider.StatRequest{
diff --git a/tests/acceptance/TestHelpers/GraphHelper.php b/tests/acceptance/TestHelpers/GraphHelper.php
index 91fc25b4926..bd7b99e7b96 100644
--- a/tests/acceptance/TestHelpers/GraphHelper.php
+++ b/tests/acceptance/TestHelpers/GraphHelper.php
@@ -143,7 +143,7 @@ public static function getEtagRegex(): string {
 	 * @return string
 	 */
 	public static function getFederatedUserRegex(): string {
-		return '(?=(.{4})*$)[A-Za-z0-9+/]*={0,2}$';
+		return self::getUUIDv4Regex() . '@[a-zA-Z-\\\.]+(:\\\d+)?';
 	}
 
 	/**
diff --git a/tests/acceptance/features/apiOcm/searchFederationUsers.feature b/tests/acceptance/features/apiOcm/searchFederationUsers.feature
index fc461a76619..7464abb9d8a 100755
--- a/tests/acceptance/features/apiOcm/searchFederationUsers.feature
+++ b/tests/acceptance/features/apiOcm/searchFederationUsers.feature
@@ -64,7 +64,7 @@ Feature: search federation users
                     ],
                     "properties": {
                       "issuer": {
-                        "const": "%local_host_port%"
+                        "const": "%local_base_url%"
                       },
                       "issuerAssignedId": {
                         "type": "string",
@@ -126,7 +126,7 @@ Feature: search federation users
                     ],
                     "properties": {
                       "issuer": {
-                        "const": "%remote_host_port%"
+                        "const": "%remote_base_url%"
                       },
                       "issuerAssignedId": {
                         "type": "string",
@@ -194,7 +194,7 @@ Feature: search federation users
                     ],
                     "properties": {
                       "issuer": {
-                        "const": "%local_host_port%"
+                        "const": "%local_base_url%"
                       },
                       "issuerAssignedId": {
                         "type": "string",
@@ -256,7 +256,7 @@ Feature: search federation users
                     ],
                     "properties": {
                       "issuer": {
-                        "const": "%remote_host_port%"
+                        "const": "%remote_base_url%"
                       },
                       "issuerAssignedId": {
                         "type": "string",
@@ -346,7 +346,7 @@ Feature: search federation users
             },
             "idp": {
               "type": "string",
-              "const": "%remote_host_port%"
+              "const": "%remote_base_url%"
             },
             "mail": {
               "type": "string",
@@ -385,7 +385,7 @@ Feature: search federation users
                   "const": "Alice Hansen"
                 },
                 "idp": {
-                  "const": "%local_host_port%"
+                  "const": "%local_base_url%"
                 },
                 "mail": {
                   "pattern": "alice@example.org"
@@ -409,7 +409,7 @@ Feature: search federation users
                   "const": "Carol King"
                 },
                 "idp": {
-                  "const": "%local_host_port%"
+                  "const": "%local_base_url%"
                 },
                 "mail": {
                   "pattern": "carol@example.org"
@@ -480,7 +480,7 @@ Feature: search federation users
                     ],
                     "properties": {
                       "issuer": {
-                        "const": "%local_host_port%"
+                        "const": "%local_base_url%"
                       },
                       "issuerAssignedId": {
                         "type": "string",
@@ -545,7 +545,7 @@ Feature: search federation users
                     ],
                     "properties": {
                       "issuer": {
-                        "const": "%remote_host_port%"
+                        "const": "%remote_base_url%"
                       },
                       "issuerAssignedId": {
                         "type": "string",
@@ -692,7 +692,7 @@ Feature: search federation users
                         ],
                         "properties": {
                           "issuer": {
-                            "const": "%remote_host_port%"
+                            "const": "%remote_base_url%"
                           },
                           "issuerAssignedId": {
                             "type": "string",
diff --git a/vendor/github.com/owncloud/reva/v2/internal/grpc/services/ocmcore/ocmcore.go b/vendor/github.com/owncloud/reva/v2/internal/grpc/services/ocmcore/ocmcore.go
index 16beba4da38..4be0e5d695c 100644
--- a/vendor/github.com/owncloud/reva/v2/internal/grpc/services/ocmcore/ocmcore.go
+++ b/vendor/github.com/owncloud/reva/v2/internal/grpc/services/ocmcore/ocmcore.go
@@ -207,7 +207,7 @@ func (s *service) UpdateOCMCoreShare(ctx context.Context, req *ocmcore.UpdateOCM
 	}
 	fileMask := &fieldmaskpb.FieldMask{Paths: []string{"protocols"}}
 
-	user := &userpb.User{Id: ocmuser.RemoteID(&userpb.UserId{OpaqueId: grantee})}
+	user := &userpb.User{Id: ocmuser.DecodeRemoteUserFederatedID(&userpb.UserId{OpaqueId: grantee})}
 	_, err := s.repo.UpdateReceivedShare(ctx, user, &ocm.ReceivedShare{
 		Id: &ocm.ShareId{
 			OpaqueId: req.GetOcmShareId(),
@@ -234,7 +234,7 @@ func (s *service) DeleteOCMCoreShare(ctx context.Context, req *ocmcore.DeleteOCM
 		return nil, errtypes.UserRequired("missing remote user id in a metadata")
 	}
 
-	share, err := s.repo.GetReceivedShare(ctx, &userpb.User{Id: ocmuser.RemoteID(&userpb.UserId{OpaqueId: grantee})}, &ocm.ShareReference{
+	share, err := s.repo.GetReceivedShare(ctx, &userpb.User{Id: ocmuser.DecodeRemoteUserFederatedID(&userpb.UserId{OpaqueId: grantee})}, &ocm.ShareReference{
 		Spec: &ocm.ShareReference_Id{
 			Id: &ocm.ShareId{
 				OpaqueId: req.GetId(),
@@ -245,7 +245,7 @@ func (s *service) DeleteOCMCoreShare(ctx context.Context, req *ocmcore.DeleteOCM
 		return nil, errtypes.InternalError("unable to get share details")
 	}
 
-	granteeUser := &userpb.User{Id: ocmuser.RemoteID(&userpb.UserId{OpaqueId: grantee})}
+	granteeUser := &userpb.User{Id: ocmuser.DecodeRemoteUserFederatedID(&userpb.UserId{OpaqueId: grantee})}
 	err = s.repo.DeleteReceivedShare(ctx, granteeUser, &ocm.ShareReference{
 		Spec: &ocm.ShareReference_Id{
 			Id: &ocm.ShareId{
@@ -262,7 +262,7 @@ func (s *service) DeleteOCMCoreShare(ctx context.Context, req *ocmcore.DeleteOCM
 			if err := events.Publish(ctx, s.eventStream, events.OCMCoreShareDelete{
 				ShareID:      share.Id.OpaqueId,
 				Sharer:       share.GetOwner(),
-				Grantee:      ocmuser.RemoteID(&userpb.UserId{OpaqueId: grantee}),
+				Grantee:      ocmuser.DecodeRemoteUserFederatedID(&userpb.UserId{OpaqueId: grantee}),
 				ResourceName: share.Name,
 				CTime:        &typespb.Timestamp{Seconds: uint64(time.Now().Unix())},
 			}); err != nil {
diff --git a/vendor/github.com/owncloud/reva/v2/internal/grpc/services/ocminvitemanager/ocminvitemanager.go b/vendor/github.com/owncloud/reva/v2/internal/grpc/services/ocminvitemanager/ocminvitemanager.go
index 000b8e24882..e7ba3ec5d96 100644
--- a/vendor/github.com/owncloud/reva/v2/internal/grpc/services/ocminvitemanager/ocminvitemanager.go
+++ b/vendor/github.com/owncloud/reva/v2/internal/grpc/services/ocminvitemanager/ocminvitemanager.go
@@ -180,8 +180,8 @@ func (s *service) ForwardInvite(ctx context.Context, req *invitepb.ForwardInvite
 	remoteUser, err := s.ocmClient.InviteAccepted(ctx, ocmEndpoint, &client.InviteAcceptedRequest{
 		Token:             req.InviteToken.GetToken(),
 		RecipientProvider: s.conf.ProviderDomain,
-		// The UserID is only a string here. To not loose the IDP information we use the FederatedID encoding
-		// i.e. base64(UserID@IDP)
+		// The UserID is only a string here. To not lose the IDP information we use the FederatedID encoding
+		// i.e. UserID@IDP
 		UserID: ocmuser.FederatedID(user.GetId(), "").GetOpaqueId(),
 		Email:  user.GetMail(),
 		Name:   user.GetDisplayName(),
@@ -219,7 +219,7 @@ func (s *service) ForwardInvite(ctx context.Context, req *invitepb.ForwardInvite
 	// we're using the provider domain as the IDP part of the ID
 	remoteUserID := &userpb.UserId{
 		Type:     userpb.UserType_USER_TYPE_FEDERATED,
-		Idp:      req.GetOriginSystemProvider().Domain,
+		Idp:      ocmuser.NormalizeOCMUserIPD(req.GetOriginSystemProvider().Domain),
 		OpaqueId: remoteUser.UserID,
 	}
 
diff --git a/vendor/github.com/owncloud/reva/v2/internal/grpc/services/ocmshareprovider/ocmshareprovider.go b/vendor/github.com/owncloud/reva/v2/internal/grpc/services/ocmshareprovider/ocmshareprovider.go
index fcec039b8f6..a55f7eb0823 100644
--- a/vendor/github.com/owncloud/reva/v2/internal/grpc/services/ocmshareprovider/ocmshareprovider.go
+++ b/vendor/github.com/owncloud/reva/v2/internal/grpc/services/ocmshareprovider/ocmshareprovider.go
@@ -325,9 +325,9 @@ func (s *service) CreateOCMShare(ctx context.Context, req *ocm.CreateOCMShareReq
 
 	// 2.b replace outgoing user ids with ocm user ids
 	// unpack the federated user id
-	shareWith := ocmuser.FormatOCMUser(ocmuser.RemoteID(req.GetGrantee().GetUserId()))
+	shareWith := ocmuser.FormatOCMUser(ocmuser.FederatedID(req.GetGrantee().GetUserId(), ""))
 
-	// wrap the local user id in a federated user id
+	// wrap the local user id in a local federated user id
 	owner := ocmuser.FormatOCMUser(ocmuser.FederatedID(info.Owner, s.conf.ProviderDomain))
 	sender := ocmuser.FormatOCMUser(ocmuser.FederatedID(user.Id, s.conf.ProviderDomain))
 
diff --git a/vendor/github.com/owncloud/reva/v2/internal/http/services/ocmd/invites.go b/vendor/github.com/owncloud/reva/v2/internal/http/services/ocmd/invites.go
index 7cf8b035ba4..a58f1dc819e 100644
--- a/vendor/github.com/owncloud/reva/v2/internal/http/services/ocmd/invites.go
+++ b/vendor/github.com/owncloud/reva/v2/internal/http/services/ocmd/invites.go
@@ -60,7 +60,7 @@ type acceptInviteRequest struct {
 	Email             string `json:"email"`
 }
 
-// AcceptInvite informs avout an accepted invitation so that the users
+// AcceptInvite informs about an accepted invitation so that the users
 // can initiate the OCM share creation.
 func (h *invitesHandler) AcceptInvite(w http.ResponseWriter, r *http.Request) {
 	ctx := r.Context()
@@ -73,7 +73,7 @@ func (h *invitesHandler) AcceptInvite(w http.ResponseWriter, r *http.Request) {
 	}
 
 	if req.Token == "" || req.UserID == "" || req.RecipientProvider == "" {
-		reqres.WriteError(w, r, reqres.APIErrorInvalidParameter, "token, userID and recipiendProvider must not be null", nil)
+		reqres.WriteError(w, r, reqres.APIErrorInvalidParameter, "token, userID and recipientProvider must not be null", nil)
 		return
 	}
 
@@ -111,7 +111,7 @@ func (h *invitesHandler) AcceptInvite(w http.ResponseWriter, r *http.Request) {
 	userObj := &userpb.User{
 		Id: &userpb.UserId{
 			OpaqueId: req.UserID,
-			Idp:      req.RecipientProvider,
+			Idp:      ocmuser.NormalizeOCMUserIPD(req.RecipientProvider),
 			Type:     userpb.UserType_USER_TYPE_FEDERATED,
 		},
 		Mail:        req.Email,
diff --git a/vendor/github.com/owncloud/reva/v2/internal/http/services/ocmd/notifications.go b/vendor/github.com/owncloud/reva/v2/internal/http/services/ocmd/notifications.go
index 41e55b344dc..37fa1b709d5 100644
--- a/vendor/github.com/owncloud/reva/v2/internal/http/services/ocmd/notifications.go
+++ b/vendor/github.com/owncloud/reva/v2/internal/http/services/ocmd/notifications.go
@@ -29,10 +29,10 @@ import (
 	ocmcore "github.com/cs3org/go-cs3apis/cs3/ocm/core/v1beta1"
 	rpc "github.com/cs3org/go-cs3apis/cs3/rpc/v1beta1"
 	typesv1beta1 "github.com/cs3org/go-cs3apis/cs3/types/v1beta1"
+	"github.com/go-chi/render"
 	"github.com/owncloud/reva/v2/pkg/appctx"
 	"github.com/owncloud/reva/v2/pkg/rgrpc/todo/pool"
 	"github.com/owncloud/reva/v2/pkg/utils"
-	"github.com/go-chi/render"
 )
 
 const (
@@ -99,7 +99,6 @@ func (h *notifHandler) Notifications(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	// TODO(lopresti) this is all to be implemented. For now we just log what we got
 	log.Debug().Msgf("Received OCM notification: %+v", req)
 
 	var status *rpc.Status
diff --git a/vendor/github.com/owncloud/reva/v2/internal/http/services/ocmd/shares.go b/vendor/github.com/owncloud/reva/v2/internal/http/services/ocmd/shares.go
index 0a3770896df..fcbc4025f66 100644
--- a/vendor/github.com/owncloud/reva/v2/internal/http/services/ocmd/shares.go
+++ b/vendor/github.com/owncloud/reva/v2/internal/http/services/ocmd/shares.go
@@ -34,11 +34,12 @@ import (
 	ocm "github.com/cs3org/go-cs3apis/cs3/sharing/ocm/v1beta1"
 	providerpb "github.com/cs3org/go-cs3apis/cs3/storage/provider/v1beta1"
 	types "github.com/cs3org/go-cs3apis/cs3/types/v1beta1"
+	"github.com/go-playground/validator/v10"
 	"github.com/owncloud/reva/v2/internal/http/services/reqres"
 	"github.com/owncloud/reva/v2/pkg/appctx"
+	ocmuser "github.com/owncloud/reva/v2/pkg/ocm/user"
 	"github.com/owncloud/reva/v2/pkg/rgrpc/todo/pool"
 	"github.com/owncloud/reva/v2/pkg/utils"
-	"github.com/go-playground/validator/v10"
 )
 
 var validate = validator.New()
@@ -124,7 +125,7 @@ func (h *sharesHandler) CreateShare(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	shareWith, _, err := getIDAndMeshProvider(req.ShareWith)
+	shareWith, _, err := getLocalUserID(req.ShareWith)
 	if err != nil {
 		reqres.WriteError(w, r, reqres.APIErrorInvalidParameter, err.Error(), nil)
 		return
@@ -197,11 +198,28 @@ func (h *sharesHandler) CreateShare(w http.ResponseWriter, r *http.Request) {
 	w.WriteHeader(http.StatusCreated)
 }
 
+func getLocalUserID(user string) (id, provider string, err error) {
+	idPart, provider, err := getIDAndMeshProvider(user)
+	if err != nil {
+		return "", "", err
+	}
+
+	// Handle nested @ in idPart (e.g. "user@idp@provider")
+	if inner := strings.LastIndex(idPart, "@"); inner != -1 {
+		id = idPart[:inner]
+	} else {
+		id = idPart
+	}
+
+	return id, provider, nil
+}
+
 func getUserIDFromOCMUser(user string) (*userpb.UserId, error) {
 	id, idp, err := getIDAndMeshProvider(user)
 	if err != nil {
 		return nil, err
 	}
+	idp = ocmuser.NormalizeOCMUserIPD(idp)
 	return &userpb.UserId{
 		OpaqueId: id,
 		Idp:      idp,
@@ -210,13 +228,21 @@ func getUserIDFromOCMUser(user string) (*userpb.UserId, error) {
 	}, nil
 }
 
-func getIDAndMeshProvider(user string) (string, string, error) {
-	// the user is in the form of dimitri@apiwise.nl
-	split := strings.Split(user, "@")
-	if len(split) < 2 {
-		return "", "", errors.New("not in the form <id>@<provider>")
+func getIDAndMeshProvider(user string) (id, provider string, err error) {
+	last := strings.LastIndex(user, "@")
+	if last == -1 {
+		return "", "", fmt.Errorf("%s not in the form <id>@<provider>", user)
 	}
-	return strings.Join(split[:len(split)-1], "@"), split[len(split)-1], nil
+
+	id, provider = user[:last], user[last+1:]
+	if id == "" {
+		return "", "", errors.New("id cannot be empty")
+	}
+	if provider == "" {
+		return "", "", errors.New("provider cannot be empty")
+	}
+
+	return id, provider, nil
 }
 
 func getCreateShareRequest(r *http.Request) (*createShareRequest, error) {
diff --git a/vendor/github.com/owncloud/reva/v2/pkg/ocm/invite/repository/json/json.go b/vendor/github.com/owncloud/reva/v2/pkg/ocm/invite/repository/json/json.go
index 2ec73c84e1e..a239736bee4 100644
--- a/vendor/github.com/owncloud/reva/v2/pkg/ocm/invite/repository/json/json.go
+++ b/vendor/github.com/owncloud/reva/v2/pkg/ocm/invite/repository/json/json.go
@@ -226,12 +226,14 @@ func (m *manager) GetRemoteUser(ctx context.Context, initiator *userpb.UserId, r
 	log := appctx.GetLogger(ctx)
 	for _, acceptedUser := range m.model.AcceptedUsers[initiator.GetOpaqueId()] {
 		log.Info().Msgf("looking for '%s' at '%s' - considering '%s' at '%s'",
-			remoteUserID.OpaqueId,
-			remoteUserID.Idp,
-			acceptedUser.Id.GetOpaqueId(),
-			acceptedUser.Id.GetIdp(),
-		)
+			remoteUserID.OpaqueId, remoteUserID.Idp,
+			acceptedUser.Id.GetOpaqueId(), acceptedUser.Id.GetIdp())
+
 		if (acceptedUser.Id.GetOpaqueId() == remoteUserID.OpaqueId) && (remoteUserID.Idp == "" || idpsEqual(acceptedUser.Id.GetIdp(), remoteUserID.Idp)) {
+			log.Info().Msgf("remote user OpaqueId:'%s' Idp:'%s' matches OpaqueId:'%s'  Idp:'%s'",
+				remoteUserID.OpaqueId, remoteUserID.Idp,
+				acceptedUser.Id.GetOpaqueId(), acceptedUser.Id.GetIdp())
+
 			return acceptedUser, nil
 		}
 	}
diff --git a/vendor/github.com/owncloud/reva/v2/pkg/ocm/provider/authorizer/json/json.go b/vendor/github.com/owncloud/reva/v2/pkg/ocm/provider/authorizer/json/json.go
index 100295bc4de..ad46c12a67b 100644
--- a/vendor/github.com/owncloud/reva/v2/pkg/ocm/provider/authorizer/json/json.go
+++ b/vendor/github.com/owncloud/reva/v2/pkg/ocm/provider/authorizer/json/json.go
@@ -173,10 +173,12 @@ func (a *authorizer) IsProviderAllowed(ctx context.Context, pi *ocmprovider.Prov
 	}
 
 	switch {
-	case !providerAuthorized:
-		return errtypes.NotFound(pi.GetDomain())
 	case !a.conf.VerifyRequestHostname:
+		log.Info().Msg("VerifyRequestHostname is disabled. any provider is allowed")
 		return nil
+	case !providerAuthorized:
+		log.Info().Msg("providerAuthorized is false")
+		return errtypes.NotFound(pi.GetDomain())
 	case len(pi.Services) == 0:
 		return ErrNoIP
 	}
diff --git a/vendor/github.com/owncloud/reva/v2/pkg/ocm/user/user.go b/vendor/github.com/owncloud/reva/v2/pkg/ocm/user/user.go
index 9be8add2b4d..501bec0257f 100644
--- a/vendor/github.com/owncloud/reva/v2/pkg/ocm/user/user.go
+++ b/vendor/github.com/owncloud/reva/v2/pkg/ocm/user/user.go
@@ -1,50 +1,76 @@
 package user
 
 import (
-	"encoding/base64"
 	"fmt"
+	"net/url"
 	"strings"
 
 	userpb "github.com/cs3org/go-cs3apis/cs3/identity/user/v1beta1"
 )
 
-// FederatedID creates a federated user id by
+// FederatedID creates a federated id for local users by
 // 1. stripping the protocol from the domain and
-// 2. base64 encoding the opaque id with the domain to get a unique identifier that cannot collide with other users
+// 2. concatenating the opaque id with the domain to get a unique identifier that cannot collide with other users
 func FederatedID(id *userpb.UserId, domain string) *userpb.UserId {
-	opaqueId := base64.URLEncoding.EncodeToString([]byte(id.OpaqueId + "@" + id.Idp))
-	return &userpb.UserId{
+	if domain == "" {
+		domain = id.Idp
+	}
+	// strip protocol from the domain
+	idp := id.Idp
+	if u, err := url.Parse(id.Idp); err == nil && u.Host != "" {
+		idp = u.Host
+	}
+	opaqueId := id.OpaqueId
+	if !strings.Contains(id.OpaqueId, "@") {
+		opaqueId = id.OpaqueId + "@" + idp
+	}
+
+	u := &userpb.UserId{
 		Type:     userpb.UserType_USER_TYPE_FEDERATED,
-		Idp:      domain,
+		Idp:      NormalizeOCMUserIPD(domain),
 		OpaqueId: opaqueId,
 	}
+
+	return u
 }
 
-// RemoteID creates a remote user id by
-// 1. decoding the base64 encoded opaque id
-// 2. splitting the opaque id at the last @ to get the opaque id and the domain
-func RemoteID(id *userpb.UserId) *userpb.UserId {
+// DecodeRemoteUserFederatedID decodes opaque id into remote user's federated id by
+// splitting the opaque id at the last @ to get the opaque id and the domain
+func DecodeRemoteUserFederatedID(id *userpb.UserId) *userpb.UserId {
 	remoteId := &userpb.UserId{
 		Type:     userpb.UserType_USER_TYPE_PRIMARY,
 		Idp:      id.Idp,
 		OpaqueId: id.OpaqueId,
 	}
-	bytes, err := base64.URLEncoding.DecodeString(id.GetOpaqueId())
-	if err != nil {
-		return remoteId
-	}
-	remote := string(bytes)
+	remote := id.OpaqueId
 	last := strings.LastIndex(remote, "@")
 	if last == -1 {
 		return remoteId
 	}
 	remoteId.OpaqueId = remote[:last]
-	remoteId.Idp = remote[last+1:]
+	remoteId.Idp = NormalizeOCMUserIPD(remote[last+1:])
 
 	return remoteId
 }
 
 // FormatOCMUser formats a user id in the form of <opaque-id>@<idp> used by the OCM API in shareWith, owner and creator fields
 func FormatOCMUser(u *userpb.UserId) string {
-	return fmt.Sprintf("%s@%s", u.OpaqueId, u.Idp)
+	if u.Idp == "" {
+		return u.OpaqueId
+	}
+	// strip protocol from the domain
+	idp := u.Idp
+	if u, err := url.Parse(u.Idp); err == nil && u.Host != "" {
+		idp = u.Host
+	}
+	return fmt.Sprintf("%s@%s", u.OpaqueId, idp)
+}
+
+// NormalizeOCMUserIPD ensures that the idp has a scheme (https://) prefix if prefix is missing
+// to keep the idp consistent across shares and received shares in the OCM share store.
+func NormalizeOCMUserIPD(idp string) string {
+	if strings.Contains(idp, "://") {
+		return idp
+	}
+	return "https://" + idp
 }
diff --git a/vendor/github.com/studio-b12/gowebdav/file.go b/vendor/github.com/studio-b12/gowebdav/file.go
index 15f45473439..80cff48b62b 100644
--- a/vendor/github.com/studio-b12/gowebdav/file.go
+++ b/vendor/github.com/studio-b12/gowebdav/file.go
@@ -32,7 +32,7 @@ func newFile(path, name string, p *propstat) *File {
 	path = FixSlashes(path)
 
 	f.name = filepath.Base(name)
-	f.path = filepath.Clean(filepath.Join(path, f.name))
+	f.path = filepath.Clean(filepath.Join(path, name))
 	f.modified = p.Modified()
 	f.etag = p.ETag()
 	f.contentType = p.ContentType()
diff --git a/vendor/modules.txt b/vendor/modules.txt
index bce990f3296..95702e9cef8 100644
--- a/vendor/modules.txt
+++ b/vendor/modules.txt
@@ -1246,7 +1246,7 @@ github.com/orcaman/concurrent-map
 # github.com/owncloud/libre-graph-api-go v1.0.5-0.20250217093259-fa3804be6c27
 ## explicit; go 1.18
 github.com/owncloud/libre-graph-api-go
-# github.com/owncloud/reva/v2 v2.0.0-20251017104024-82c22e954c1c
+# github.com/owncloud/reva/v2 v2.0.0-20251106102926-751223b32d48
 ## explicit; go 1.24.0
 github.com/owncloud/reva/v2/cmd/revad/internal/grace
 github.com/owncloud/reva/v2/cmd/revad/runtime
@@ -1851,7 +1851,7 @@ github.com/stretchr/testify/assert
 github.com/stretchr/testify/assert/yaml
 github.com/stretchr/testify/mock
 github.com/stretchr/testify/require
-# github.com/studio-b12/gowebdav v0.9.0 => github.com/kobergj/gowebdav v0.0.0-20250102091030-aa65266db202
+# github.com/studio-b12/gowebdav v0.9.0 => github.com/kobergj/gowebdav v0.0.0-20251030165916-532350997dde
 ## explicit; go 1.17
 github.com/studio-b12/gowebdav
 # github.com/tchap/go-patricia/v2 v2.3.3
@@ -2475,7 +2475,7 @@ sigs.k8s.io/yaml
 # stash.kopano.io/kgol/rndm v1.1.2
 ## explicit; go 1.13
 stash.kopano.io/kgol/rndm
-# github.com/studio-b12/gowebdav => github.com/kobergj/gowebdav v0.0.0-20250102091030-aa65266db202
+# github.com/studio-b12/gowebdav => github.com/kobergj/gowebdav v0.0.0-20251030165916-532350997dde
 # github.com/egirna/icap-client => github.com/kobergj/icap-client v0.0.0-20250116172800-8eaa5022532b
 # github.com/unrolled/secure => github.com/DeepDiver1975/secure v0.0.0-20240611112133-abc838fb797c
 # github.com/go-micro/plugins/v4/store/nats-js-kv => github.com/kobergj/plugins/v4/store/nats-js-kv v0.0.0-20240807130109-f62bb67e8c90