How do I unlock my Apple Watch?
Apple Watch unlock
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[Edited by Moderator]
iPhone 12 Pro
Question marked as
If you have forgotten the Apple ID and password that has been used to pair the watch to your iPhone, and you have proof of purchase or ownership, you can contact the official Apple Support, to get the Activation Lock disabled.
Have a look at these related articles:
About Activation Lock on your Apple Watch - Apple Support
Additional Support - Activation Lock
If a previous owner did not disable the Activation Lock and you have no proof of ownership, the Activation Lock can not be disabled.