Hi Suri123,
Writable volumes and UEM will work together, that should not be the issue.
When the user is logged in, do you see if the writable volumes is attached from the Manager Interface?
Also make sure the that:
1. Limit the attachment of user writables to specific computers is disabled or correctly configured.
2. Operating Systems is set to the correct OS of the client where the writable is being used.
Regards,