How to reset Apple Watch with a new Apple ID?
i change my Apple ID in with my phone but I can’t cannot in my Apple Watch
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You will need to unpair the watch from the iPhone that has been connected to the watch, or disable the Activation Lock on the web, as explained in this article:
About Activation Lock on your Apple Watch - Apple Support
In case you have proof of purchase or ownership, as explained in this related article, the official Apple Support can disable the Activation Lock: