Unpair iCloud from previous owner that you can’t contact?
How can I unpair an Apple Watch if I don’t know the iCloud if the previous owner?
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The person that you bought/got this watch from needs to follow all the steps in this link;
Remove the Activation Lock so that the buyer can use it.
If they can't or won't then get your money back or recycle the watch and mark it down as a bad experience.