Please tell How to open Activation lock for Apple Watch.
Apple Watch, watchOS 4
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If the watch is activation locked to another person, you must ask them to remove the lock. Activation lock is one of the best theft deterrent systems out there, there is no way that you could avoid that.
If the watch is locked to an old Apple ID of yourself and you cannot recover the login information of that apple id, you can start an activation lock support request at Apple
See this link for further reference
How to remove Activation Lock - Apple Support