Re: Why is only one of my AirPods working when both are connected?
We do not know how you use the AirPods Pro, what computer)s) or device(s) you use them with, what may have happened to them, whether or not they need cleaning, what settings you are using, or whether both AirPods and case are charging ok ... etc.
Eg: Wondering if the volume on one AirPod is set so low you can not hear anything:
See: Pause, skip, and adjust volume with your AirPods and AirPods Pro - Apple Support
Also see how to: Customize headphone audio levels on your iPhone or iPad - Apple Support
If needed: Learn what to do: If your left or right AirPod isn't working - Apple Support
and
How to: How to reset your AirPods and AirPods Pro - Apple Support
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Resource:
AirPods User Guide - Apple Support
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More support . info. if needed:
Eg: Find all the topics, resources, and contact options you need for your AirPods....
AirPods Support Website: AirPods Support - Official Apple Support