Fingerprint already present on other user account
Steps to resolve (as the old account was deleted)
- Stop "Windows Biometric service" (WbioSrvc)
- Go to "C:\Windows\System32\WinBioDatabase"
- Delete all files (I suspect GUID's to be bound to different logins)
- Start "Windows Biometric service" (WbioSrvc)
Now I could add my fingerprint to my Azure logon on the computer.