Authorization on the file server when connecting via VPN. How to recover?

Question

VPN

Greetings colleagues!
At some point, authorization on the file server (windows server 2016) broke down when users connected via VPN.
VPN is integrated with AD. Authorization on the vpn server using AD accounts.
Previously, when connecting via vpn, users connected to the \\server.domen\share file server and authorization using VPN credentials worked.
Now access is gone, an error like "access denied". The logs show that authorization from the user "Guest".
When explicitly specifying the account net use z: \\server.domen\share /user:domen.local\user everything works fine.
The parameter in pbk is specified as UseRasCredentials=1
What can be twisted?