When charged, does the headset turn on and produce sound?
Connect the charging case to an AC outlet, and then set the headset in the charging case.
After charging is complete, remove the headset from the charging case to turn it on, and check if the headset produces sound.
NOTE: The image is an example of WF-1000XM3.
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Produces sound
The issue was caused by a low battery level in the headset.
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Turns on but does not produce sound
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Does not turn on
It may not be possible to charge correctly.
Refer to the troubleshooting navigator "Cannot Charge" to find a solution.