Unable to log in keyboard stuck on capitals

I'm assuming you tried to press the Caps Lock key in order to try to toggle it off.

Did you also try pressing the Shift keys to see if one of them is stuck?

Have you tried pressing the Shift key while entering your alphabetic characters?

Have you tried to restart the computer?

Have you disconnected all external devices & also rebooted with no external devices connected?

Try an external keyboard.

AliFlan wrote:

Tried an external keyboard unfortunately still the same issue.

Very odd! How exactly do you know that it is "stuck on capitals"?