How do I erase the Apple ID that is already on my watch?
I bought a used Apple Watch. It has been reset but their Apple ID is still on it. How do I erase their ID?
Apple Watch
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You cannot,only the previous owner can.
About Activation Lock on your Apple Watch - Apple Support
Contact the seller and have them follow all the steps on this page;
If they can't or won't,get your money back as this watch is of no use to you.