Sam took a long vacation and now he keeps getting a password challenge in Windows 10, rather than his PIN. Leo says he can't set up Windows with a PIN unless he sets a password. It's likely tied to his Microsoft account. Leo says to try that. Once he inserts it, then he's logged in. It probably reverted to the Microsoft password after a long time of inactivity. Once he uses the Windows password again, he'll be good to go.