diff --git a/moto/transfer/models.py b/moto/transfer/models.py
index 1abd08644001..ef8caaa00da6 100644
--- a/moto/transfer/models.py
+++ b/moto/transfer/models.py
@@ -184,7 +184,7 @@ def create_user(
                 {
                     "date_imported": str(now),
                     "ssh_public_key_body": ssh_public_key_body,
-                    "ssh_public_key_id": "mock_ssh_public_key_id_{ssh_public_key_body}_{now}",
+                    "ssh_public_key_id": f"{server_id}:{user_name}:public_key:{now}",
                 }
             ]
             user.ssh_public_keys = ssh_public_keys
diff --git a/tests/test_transfer/test_transfer.py b/tests/test_transfer/test_transfer.py
index 526f64412231..584db5193253 100644
--- a/tests/test_transfer/test_transfer.py
+++ b/tests/test_transfer/test_transfer.py
@@ -197,6 +197,9 @@ def test_create_describe_and_delete_user(client, server):
     assert user["PosixProfile"]["Gid"] == 1
     assert user["Role"] == "TransferFamilyAdministrator"
     assert user["SshPublicKeys"][0]["SshPublicKeyBody"] == "ED25519"
+    assert user["SshPublicKeys"][0]["SshPublicKeyId"].startswith(
+        f"{server_id}:{user_name}:public_key:"
+    )
     assert user["Tags"][0]["Key"] == "Owner"
     assert user["Tags"][0]["Value"] == "MotoUser1337"
     assert user["UserName"] == "test_user"