NUM lock disabled at login

The Cause

Cannot use the numeric keypad on the keyboard while at the MyPC login screen, but works OK when logged in. 

The Solution

Here are articles showing many ways to enable this feature in Windows.

Enable Num Lock on startup or reboot in Windows 11/10 (thewindowsclub.com)

Enable NumLock on the Windows 10 Login screen/Lock screen (winaero.com)