My right ear bud doesn’t play after pairing
Right earbud doesn’t play after pairing with iPhone
Right earbud doesn’t play after pairing with iPhone
Did you already try the troubleshooting mentioned in this article?
If your left or right AirPod isn't working - Apple Support
How to reset your AirPods and AirPods Pro - Apple Support
Also check Settings -> Accessibility -> Audio/Visual, to make sure, the audio volume balance is set to the center.
My right ear bud doesn’t play after pairing