There could be several reasons why a domain user is unable to log in to a Windows 11 device after an upgrade. One possible reason could be related to the user’s login script. Some users have reported that fixing their login script or switching to Group Policy drive mapping resolved the issue. Another possible reason could be related to the Falcon sensor for Windows. There was an issue with Falcon Identity Protection that blocked Kerberos authentications performed by hosts running Windows 11 version 22H2, but this issue has been fixed in a hotfix for Falcon sensor for Windows 6.46.16012/6.47.16104.