Hello PurushottamNeupane,
Thank you for posting in Microsoft Community forum.
Is the computer name entered when you are currently remotely connected to the FQDN or IP address? You can try to switch to see if the problem is fixed.
In addition, you can try switching accounts or devices to see if the problem persists. Trying to reset your password is also a valid attempt.
We recommend that you troubleshoot the security logs and check the specific information when logging in, which will provide more information
I hope the information above is helpful.
If you have any question or concern, please feel free to let us know.
Best Regards,
Haijian Shan