I am unable to add a feature service to ArcMap (version 10.2.1). I get a warning that says, "Could not add the specified data object to the map. Item not found in this collection." I can add other feature services from the same ArcGIS Server (version 10.6.1). I'm using a 'User' connection, not a Publisher/Admin connection to try and add to the map. The only differences I can see compared to the other feature services are operations allowed. The service is being consumed by a web application and is otherwise working properly. It just can't be added to ArcMap. Appreciate any help...