My left ear bub is still not working
My left ear bud isn’t working
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Did you try all the steps in:
If your left or right AirPod isn't working - Apple Support
including:
How to reset your AirPods and AirPods Pro - Apple Support
If so, then see the 'Replace a missing AirPod or charging case' section in:
Find your lost AirPods - Apple Support