Apple Watch won’t charge or turn on
Watch suddenly won’t charge or turn on
Apple Watch Series 6
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Try all the steps in:
If your Apple Watch won't charge or it won't turn on - Apple Support
If you still need help, contact Apple Support.
Your best option may be to make an appointment at the Genius Bar in an Apple Store near your and let them look at it:
Genius Bar Reservation and Apple Support Options - Apple