Hello, I've sold my Apple Watch, but there is a problem with pairing with new phone of another customer.
First, I pressed RESET in Watch, after that they were deleted automatically from MY DEVICES, then I unpair them in WATCH App. But still when another person is trying to connect it, he sees my Apple account.
What can I do?
Apple Watch
Ask him to go into settings on the Apple Watch, and go to General, then scroll to the bottom to Reset, and Press Erase All Content and Settings. This should erase everything from the Apple Watch. Tip: remember, if you have an Apple Watch and you want to unpair it, don't only unpair it from your iPhone's Watch app, but also do it on your Apple Watch to make sure that it is fully unlinked.
Hope this helps!
Watch unpair from Apple ID account
