My Workaround for PIN that stopped working on Windows 10 ASUS VivoTab Smart tablet
I tried all the solutions I could find on Internet searches that worked for other people, not necessarily on a Windows 10 ASUS VivoTab Smart tablet, but none of them worked for me. This includes:
• Using SFC /scannow from a Command Prompt (Admin). The SFC program ran OK but found no issues to fix.
• Removing all the files in the C:\Windows\ServiceProfiles\LocalService\AppData\Local\Microsoft\Ngc folder. Mine had no files in this folder and removing the folder itself did nothing.
• Going to Settings / Accounts / Sign-in Options and hitting the "Remove" button associated with "PIN" or "Forgot my PIN". On my tablet at the PIN setup screen it didn't show the "Change" and "Remove" button, it just has an "Add" button. If the tablet has just been started the "Add" button was available to press and it will take me to the screen that asks for my Windows Password but from there it does some gyrations and then takes me back to the PIN screen where the "Add" button is now greyed out. If I back out and try to do this all over again there are generally no options available after I select Sign-in Options … just a white screen … no "Require sign-in", no Windows Hello, no Password, no PIN, no Picture password and no Privacy options.
• One suggestion was to change your Password to what your PIN was but I don't know how that could possibly work since the PIN requires four (4) numbers and the Password requires at least 8 characters and contain at least two of the following: uppercase letters, lowercase letters, numbers and symbols.
My workaround which is OK with me since it seems as fast as using the PIN is using the Picture Password. For this I restarted my tablet, so I would actually have something on the Sign-in Options screen.
• First find a picture and put it in a folder on your computer that you know will always be there. I would suggest experimenting with different pics that will allow you to make three (3) finger swipes to different areas of the picture that you'll remember.
• Go to Settings / Accounts / Sign-in Options and select the "Add" button under the Picture password option.
• Browse to the picture you want to use and select it.
• Follow the instructions for adjusting the picture (so you can see all the areas you need), and then make your three (3) distinct finger moves. If you don't get it quite right it will tell you and you can do things over.
The next time you need to login you should see a Sign-in Options that you can select icons to start using your Picture or your regular Windows password to sign-in with.
Maybe Microsoft will eventually get the PIN working again.