After restore of a truenas backup no access with samba

[Stephan4711]

I today restored a truenas backup.
Now I'm not able to login with a Windows machine anymore.

the only thing I see in my logfile is:

{"timestamp": "2023-10-03T20:17:09.206360+0200", "type": "Authentication", "Authentication": {"version": {"major": 1, "minor": 2}, "eventId": 4625, "logonId": "0", "logonType": 3, "status": "NT_STATUS_NO_SUCH_USER", "localAddress": "ipv4:192.168.100.97:445", "remoteAddress": "ipv4:192.168.100.189:52335", "serviceDescription": "SMB2", "authDescription": null, "clientDomain": "MicrosoftAccount", "clientAccount": "username", "workstation": "Computername", "becameAccount": null, "becameDomain": null, "becameSid": null, "mappedAccount": "username", "mappedDomain": "MicrosoftAccount", "netlogonComputer": null, "netlogonTrustAccount": null, "netlogonNegotiateFlags": "0x00000000", "netlogonSecureChannelType": 0, "netlogonTrustAccountSid": null, "passwordType": "NTLMv2", "duration": 1271}}

Just changed the username and computername in the log!
I don't understand, why I get no such user after restore. It's the same username and password before restore.