Update temporary "Unknown UserUMMTGUN2" name to "Unknown UserUMMTGUN3" to see if Diva's recent HG updates (post 6c7e33f) fix this issue.

This string is returned if a UserManagementModule.TryGetUserNames() cannot find a server-side name binding or a user account for a given UUID.
This is only called when the viewer requests a binding via the UDP UUIDNameRequest message