One earbud not working

Re: One earbud not working: I have cleaned the contacts and have reset the pod.

That was a good start ... even if you found you still need help:

Apple support have an article online (link below) that may be helpful:

Learn what to do: If your left or right AirPod isn't working - Apple Support

Also: you might want to check that the volume on the AirPod is sufficient:

Pause, skip, and adjust volume with your AirPods and AirPods Pro - Apple Support