I go to the transport control and click on metronome/click button and activate it. Nothing.
So then I go to the metronome setup and click activate midi click and choose my midisport for the midi port channel. The note they have is C3 and the velocity is up. I also have Activate Audio click and have beeps selected. I also have use click for in record, and play.
If you have opened Cubase without your audio interface being turned on, Cubase will try to use any audio interface available. That changes the click assignment in vst-connections (F4). When you later start it up with the audio-interface on, then the click assignment is not remembered and you will have to go back to (F4) to Assign it again.
That is the most common problem with missing click I have had/seen.
I recently downloaded MetroGnome, a VSTi by TobyBear Productions. I actually needed it to render a click track and that can’t be done with the built-in Cubase. Anyway, just suggesting that if you can’t get your built-in metronome to work then this could be an alternative for you.