Apple Watch 7 not charging!
How to fix Apple Watch 7 when it stops charging and followed steps as per Apple support instructions?
Apple Watch Series 7
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Follow 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 you and let them look at it:
Genius Bar Reservation and Apple Support Options - Apple