Key board not working

Hi,

See: Set up your Magic Keyboard, Magic Mouse, or Magic Trackpad with your Mac - Apple Support

Hi!

I had the same problem. When following the instructions given by tsk the pairing code did not show up on my Mac. I rebooted the Mac a few times until I realized what happened. The Keyboard was connecting to my iPad. I removed the keyboard from my iPad and re-pair the keyboard to the Mac. I'm writing this reply with it.

Check other devices to make sure it's not connected to any other device (Apple or not).