i bought a apple watch from this person and they do not know the apple id to it
what do i do if the original owner don’t know the apple id to there old apple watch
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Return the Watch for a refund or get them to do the things in this article What to do before you sell, give away, or trade in your Apple Watch, or buy one from someone else - Apple Support
This support article has information about Activation Lock on your Apple Watch and how to turn it off as part of preparing a Watch for service or a new owner. --> About Activation Lock on your Apple Watch - Apple Support