diff --git a/app/lib/login/cubit.dart b/app/lib/login/cubit.dart
index 8237a67b..4e64e667 100644
--- a/app/lib/login/cubit.dart
+++ b/app/lib/login/cubit.dart
@@ -15,10 +15,13 @@ class LoginCubit extends Cubit<LoginState> {
   // signInAndLoadUserData authenticates a user with a Lab and fetches their
   // genomic data from it's endpoint.
   Future<void> signInAndLoadUserData(BuildContext context, Lab lab) async {
-    emit(LoginState.loadingUserData(null));
+    emit(LoginState.loadingUserData(
+      lab.authLoadingMessage(),
+      cancelable: lab.cancelAuthInApp,
+    ));
     try {
       await lab.authenticate();
-    } on LabAuthenticationCanceled {
+    } on LabProcessCanceled {
       revertToInitialState();
       return;
     } on LabAuthenticationError {
@@ -29,13 +32,18 @@ class LoginCubit extends Cubit<LoginState> {
       return;
     }
 
+    if (lab.authenticationWasCanceled) {
+      lab.authenticationWasCanceled = false;
+      return;
+    }
+
     try {
       final loadingMessage = shouldFetchDiplotypes()
         // ignore: use_build_context_synchronously
         ? context.l10n.auth_loading_data
         // ignore: use_build_context_synchronously
         : context.l10n.auth_updating_data;
-      emit(LoginState.loadingUserData(loadingMessage));
+      emit(LoginState.loadingUserData(loadingMessage, ));
       if (shouldFetchDiplotypes()) {
         final (labData, activeDrugList) = await lab.loadData();
         await saveDiplotypesAndActiveDrugs(
@@ -59,8 +67,10 @@ class LoginCubit extends Cubit<LoginState> {
 @freezed
 class LoginState with _$LoginState {
   const factory LoginState.initial() = _InitialState;
-  const factory LoginState.loadingUserData(String? loadingMessage) =
-    _LoadingUserDataState;
+  const factory LoginState.loadingUserData(
+    String? loadingMessage,
+    {bool? cancelable}
+  ) = _LoadingUserDataState;
   const factory LoginState.loadedUserData() = _LoadedUserDataState;
   const factory LoginState.error(String string) = _ErrorState;
 }
diff --git a/app/lib/login/models/app_share_flow_lab.dart b/app/lib/login/models/app_share_flow_lab.dart
index 4d8e4f32..245d0f13 100644
--- a/app/lib/login/models/app_share_flow_lab.dart
+++ b/app/lib/login/models/app_share_flow_lab.dart
@@ -11,17 +11,29 @@ class AppShareFlowLab extends Lab {
   late Uri publishUrl;
   late Map<String, String>? publishHeaders;
 
+  @override
+  // ignore: overridden_fields
+  bool cancelAuthInApp = true;
+
+  @override
+  String? authLoadingMessage() =>
+    'Please open the $shareAppName and share your data with PharMe';
+
   @override
   Future<void> authenticate() async {
+    // THIS IS FOR TESTING, SHOULD WAIT UNTIL A DEEP LINK IS RECEIVED
+    // (if possible like this but could set metadata field when deep link
+    // caught and wait here until it was set)
+    await Future.delayed(Duration(seconds: 7));
+  }
+  
+  @override
+  Future<(List<LabResult>, List<String>)> loadData() async {
     // THIS IS FOR TESTING, SHOULD GET FROM DWA
     publishUrl = Uri.parse(
       'https://hpi-datastore.duckdns.org/userdata?id=1e006a69-b693-43d2-a318-22904e305b5c',
     );
     publishHeaders = null;
-  }
-  
-  @override
-  Future<(List<LabResult>, List<String>)> loadData() async {
     return fetchData(
       publishUrl,
       headers: publishHeaders,
diff --git a/app/lib/login/models/lab.dart b/app/lib/login/models/lab.dart
index 26dd20ab..e50e5849 100644
--- a/app/lib/login/models/lab.dart
+++ b/app/lib/login/models/lab.dart
@@ -4,8 +4,8 @@ import 'package:http/http.dart' as http;
 
 import '../../common/module.dart';
 
-class LabAuthenticationCanceled implements Exception {
-  LabAuthenticationCanceled();
+class LabProcessCanceled implements Exception {
+  LabProcessCanceled();
 }
 
 class LabAuthenticationError implements Exception {
@@ -18,6 +18,10 @@ class Lab {
   });
 
   String name;
+  bool cancelAuthInApp = false;
+  bool authenticationWasCanceled = false;
+
+  String? authLoadingMessage() => null;
   
   Future<void> authenticate() async {}
   Future<(List<LabResult>, List<String>)> loadData() async {
diff --git a/app/lib/login/models/oauth_authorization_code_flow_lab.dart b/app/lib/login/models/oauth_authorization_code_flow_lab.dart
index dc97f373..7eaf4636 100644
--- a/app/lib/login/models/oauth_authorization_code_flow_lab.dart
+++ b/app/lib/login/models/oauth_authorization_code_flow_lab.dart
@@ -46,7 +46,7 @@ class OAuthAuthorizationCodeFlowLab extends Lab {
       token = jsonDecode(response.body)['access_token'] as String;
     } on PlatformException catch (e) {
       if (e.code == 'CANCELED') {
-        throw LabAuthenticationCanceled();
+        throw LabProcessCanceled();
       }
     }
     if (token == null) {
diff --git a/app/lib/login/pages/login.dart b/app/lib/login/pages/login.dart
index 17682569..6e1853ca 100644
--- a/app/lib/login/pages/login.dart
+++ b/app/lib/login/pages/login.dart
@@ -4,6 +4,7 @@ import 'package:provider/provider.dart';
 import '../../../common/module.dart';
 import '../cubit.dart';
 import '../models/app_share_flow_lab.dart';
+import '../models/lab.dart';
 import '../models/oauth_authorization_code_flow_lab.dart';
 
 final labs = [
@@ -28,6 +29,10 @@ class LoginPage extends HookWidget {
 
   final LoginCubit? cubit;
 
+  Lab _getSelectedLab(ValueNotifier<String> dropdownValue) => labs.firstWhere(
+    (lab) => lab.name == dropdownValue.value,
+  );
+
   @override
   Widget build(BuildContext context) {
     final dropdownValue = useState(labs.first.name);
@@ -41,7 +46,7 @@ class LoginPage extends HookWidget {
               child: state.when(
                 initial: () =>
                     _buildInitialScreen(context, dropdownValue),
-                loadingUserData: (loadingMessage) => Padding(
+                loadingUserData: (loadingMessage, cancelable) => Padding(
                   padding: EdgeInsets.all(PharMeTheme.largeSpace),
                   child: Column(
                     children: [
@@ -54,6 +59,19 @@ class LoginPage extends HookWidget {
                           textAlign: TextAlign.center,
                         ),
                       ],
+                      if (cancelable ?? false) ...[
+                        SizedBox(height: PharMeTheme.largeSpace),
+                        FullWidthButton(
+                          context.l10n.action_cancel,
+                          () {
+                            final selectedLab = _getSelectedLab(dropdownValue);
+                            selectedLab.authenticationWasCanceled = true;
+                            context
+                              .read<LoginCubit>()
+                              .revertToInitialState();
+                          }
+                        )
+                      ],
                     ],
                   ),
                 ),
@@ -73,12 +91,9 @@ class LoginPage extends HookWidget {
     ValueNotifier<String> dropdownValue,
   ) {
     Future<void> action() async {
-      final selectedLab = labs.firstWhere(
-        (el) => el.name == dropdownValue.value,
-      );
       await context
           .read<LoginCubit>()
-          .signInAndLoadUserData(context, selectedLab);
+          .signInAndLoadUserData(context, _getSelectedLab(dropdownValue));
     }
 
     return _buildColumnWrapper(