what if the owner does not remember their iCloud or apple id?
how can I remove activation lock on my Apple Watch with out Apple ID?
Apple Watch Series 3, watchOS 6
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You can't. It is an anti-theft measure.
See if they can recover the ID/password.
Apple ID - How to find your Apple An iCloud e-mail address is an Apple ID.
For the Apple ID password, enter the Apple (iCloud) ID and click Forgot Password.