If your AirPods' microphone is not working, there are many possible causes, but you can try a variety of fixes quickly.

If one AirPod isn't working by not connecting or playing audio, there are many possible problems, but they're all easy to check.

Is there anything as existentially frustrating as one of your AirPods dying on you? It would almost be preferable for both of them to malfunction because at least that way you don't have to bother ...