Новый владелец не может подключить Apple Watch
Я продала свои часы 7-й серии, разорвала с ними пару, но новый владелец не может к ним подключиться
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You as a previous owner can disable the Activation Lock for the Apple Watch, which can also be done via the iCloud Account over the Web:
About Activation Lock on your Apple Watch - Apple Support
If this does not work, and you have given the new owner proof of purchase or ownership, as explained in this related article, the official Apple Support can disable the Activation Lock: