Change Windows Hello Pin

Change or reset your PIN when you're already signed in
You can use the Settings app to change your PIN.
In the Settings app  on your Windows device, select Accounts > Sign-in options or use the following shortcut:
Sign-in options
Select PIN (Windows Hello) > Change PIN and then follow the instructions. You must enter your old PIN in order to change to a new one
If you forgot your PIN, select I forgot my PIN and follow the directions to verify your account and create a new one.