Found and working for me: (MS-Forum-Build 9926) To repair your PIN & picture password: 1. Open File Explorer and browse to this location: C:\Windows\ServiceProfiles\LocalService\AppData\Local\Microsoft\NGC 2. Delete everything within that folder 3. Go to Settings-> Accounts->Sign-in Options * by me: change to local Account, reboot, switch to MS-Account 4. Click Add a PIN again and set your PIN 5. PIN sign in should work going forward