Hello,
I will walk through a few steps with you. Some of these are just to help figure out what is wrong, not to fix it right away. So if nothing changes after a step, that is normal. I will keep going until we solve it.
I can’t log in on my desktop using my pin.
Please tell the exact error that happens when you try to log in using your PIN. If possible, please add a photo.
Did the PC updated recently?
Troubleshoot Problems Signing In to Windows
I look forward to hearing from you to get the results of the troubleshooting.