diff --git a/apricot/oauth/keycloak_client.py b/apricot/oauth/keycloak_client.py
index 8c2f58d..a4d939a 100644
--- a/apricot/oauth/keycloak_client.py
+++ b/apricot/oauth/keycloak_client.py
@@ -53,9 +53,9 @@ def groups(self) -> list[JSONDict]:
                 # If group_gid exists then set the cache to the same value
                 # This ensures that any groups without a `gid` attribute will receive a
                 # UID that does not overlap with existing groups
-                if group_gid := group_dict["attributes"]["gid"]:
+                if (group_gid := group_dict["attributes"]["gid"]) and len(group_dict["attributes"]["gid"]) == 1:
                     self.uid_cache.overwrite_group_uid(
-                        group_dict["id"], int(group_gid, 10)
+                        group_dict["id"], int(group_gid[0], 10)
                     )
 
             # Read group attributes
@@ -72,7 +72,7 @@ def groups(self) -> list[JSONDict]:
                 attributes: JSONDict = {}
                 attributes["cn"] = group_dict.get("name", None)
                 attributes["description"] = group_dict.get("id", None)
-                attributes["gidNumber"] = group_dict["attributes"]["gid"]
+                attributes["gidNumber"] = group_dict["attributes"]["gid"][0]
                 attributes["oauth_id"] = group_dict.get("id", None)
                 # Add membership attributes
                 members = self.query(
@@ -107,9 +107,9 @@ def users(self) -> list[JSONDict]:
                 # If user_uid exists then set the cache to the same value.
                 # This ensures that any groups without a `gid` attribute will receive a
                 # UID that does not overlap with existing groups
-                if user_uid := user_dict["attributes"]["uid"]:
+                if (user_uid := user_dict["attributes"]["uid"]) and len(user_dict["attributes"]["uid"]) == 1:
                     self.uid_cache.overwrite_user_uid(
-                        user_dict["id"], int(user_uid, 10)
+                        user_dict["id"], int(user_uid[0], 10)
                     )
 
             # Read user attributes
@@ -139,12 +139,12 @@ def users(self) -> list[JSONDict]:
                 attributes["displayName"] = full_name
                 attributes["mail"] = user_dict.get("email")
                 attributes["description"] = ""
-                attributes["gidNumber"] = user_dict["attributes"]["uid"]
+                attributes["gidNumber"] = user_dict["attributes"]["uid"][0]
                 attributes["givenName"] = first_name if first_name else ""
                 attributes["homeDirectory"] = f"/home/{username}" if username else None
                 attributes["oauth_id"] = user_dict.get("id", None)
                 attributes["sn"] = last_name if last_name else ""
-                attributes["uidNumber"] = user_dict["attributes"]["uid"]
+                attributes["uidNumber"] = user_dict["attributes"]["uid"][0]
                 output.append(attributes)
         except KeyError:
             pass
diff --git a/run.py b/run.py
index ae3dbf0..c228f20 100644
--- a/run.py
+++ b/run.py
@@ -17,7 +17,7 @@
         parser.add_argument("-p", "--port", type=int, default=1389, help="Port to run on.")
         parser.add_argument("-s", "--client-secret", type=str, help="OAuth client secret.")
         parser.add_argument("--disable-mirrored-groups", action="store_false",
-                             dest="enable_mirrored", default=True,
+                             dest="enable_mirrored_groups", default=True,
                              help="Disable creation of mirrored groups.")
         parser.add_argument("--debug", action="store_true", help="Enable debug logging.")
         # Options for Microsoft Entra backend