Part 1: What Causes the Windows 10 PIN Not Working? In this article, we look at different solutions on how to fix Windows 10 PIN login not working and what causes the PIN to stop working. We all know how important the Windows PIN code is and you will be frustrated when you cannot have the option to enter thePIN code or when the computer does not recognize it. Kindly help.'Ī number of Windows users have reported issues on Windows 10 PIN not working especially after Windows 10 update. When I have switched my laptop on the PINbox has disappeared and I could not log in. 'Yesterday's update has made my laptop unable to use.