my right side airpod pro not working though fully charged

Did you already try the troubleshooting mentioned in this article?

If your left or right AirPod isn't working - Apple Support

I received my AirPods Pro as a birthday gift. When they arrived, the right one did not work properly and it was replaced. Now the right one is not working at all, and the button does not click.

Resetting them solved the problem.