Stranger than strange - Imac twenty 7" - magic keyboard - no number TWO

If the on-screen keyboard also won't enter a 2. then it's not a hardware problem. What language keyboard do you have? Try adding a different language keyboard in Keyboard system preference and see if 2 works on both the hardware and screen keyboards.

FWIW, if you click on the number 2 with the mouse/trackpad and the 2 doesn't show, then it wouldn't be a hardware problem. If the key is broken and you type the 2 key and it doesn't show up on the Keyboard Viewer, then it's still a hardware problem.

ashwanifromdubai wrote:

However, If use a logitech keyboard, I can type the number two. This means that the problem is to do with the "driver" from magic keyboard and Mojave.

No, that normally means that the problem is with the 2 key on your magic keyboard.

If you mean the same Magic Keyboard won't type the number 2 on either your 27" or 21" iMacs, it's more likely the key has failed.