If there's no sound in one airpod make sure that your charging case is fully charged If one of your airpods stops working, the first thing you want to check is if it is charged Place both airpods in your charging case and let them charge for 30 seconds.
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If that doesn’t work, try a hard reset
Make sure both airpods are charging correctly and that the apple device you’re connecting to is up to date.
Here are 11 easy ways to fix charging, sound, or connection issues—works for airpods pro and all models. If one of your airpods drops the connection or stops working, you can try to reset the device and the case by following these steps You may also need to reset your iphone's network settings if the problem persists.