Sometimes Windows biometrics bugs out. Especially when you installed your computer as a work pc and had Active Directory set-up at first, it can every now simply forget and get into a loop requesting you to set-up a pin before using Windows Hello on the logon screen.
The "Quick"-"Fix"
- Go to Windows > Settings > Accounts > Sign-in Options
- Remove Iris/Facial Recognition
- Remove PIN
- Press Windows + R
- Enter: services.msc
- Stop Windows Biometric Services
- Press Windows + R again
- Enter: C:\Windows\System32\WinBioDatabase\
- Delete all files in this directory (assuming you are the only user)
- Reboot system
- Go to Windows > Settings > Accounts > Sign-in Options (again)
- Set up PIN
- Set up Iris / Facial Recognition
Done!
If you had several users using Windows Biometrics, they will have to re-setup their facial regocnition and pin