One AirPod Isn’t Working
If it’s just one AirPod that’s not working, the first thing you need to make sure is that this seemingly faulty AirPod is fully charged. You can quickly check the charge level of a single AirPod by opening the case and removing just one. The AirPods status screen that pops up on your iPhone will update to show the individual charge levels of each earbud.
If that isn’t the problem, you can try putting both AirPods in the case. Then, make sure to only take out the faulty AirPod and try connecting it to your iPhone.
If that doesn’t work, try unparing your AirPods as we previously showed you. Of course, you can always reset your AirPods if the other steps don’t work.