Bought the watch it’s still paired to the owner need to reset it
How do I reset Apple Watch still paired to the original owner
Apple Watch
Question marked as
Only the original owner can unlock the watch. Do you know them? If yes, they need to remove the watch from their account. If no, you've purchased a useless watch Apple won't help you unlock, nor can we.
If you know the original owner, this is what they (not something you or anyone else can) do --> What to do before you sell, give away, or trade in your Apple Watch, or buy one from someone else - Apple Support
And if you don't know them or can't reach them, see if you can get your money back and if that is not a possibility, recycle the watch responsibility and chalk this up to a bad buying decision.
Also, read this --> https://discussions.apple.com/docs/DOC-250001038