Apple Watch won’t work like it won’t let said locked by owner

Activation Lock is designed to prevent anyone else from using an Apple Watch if it's ever lost or stolen.

About Activation Lock on your Apple Watch - Apple Support

Activation Lock is an anti-theft feature that cannot be bypassed. Only the previous owner can remove the lock by using their Apple ID & password. Apple will not help you find the previous owner. If the previous owner cannot or will not remove the lock, then the watch is useless to you or anyone else. Try to get a refund (through eBay) or dispose of the watch properly. In the future, see the 'Before you buy a watch from a third-party' section in:

What to do before you sell, give away, or trade in your Apple Watch, or buy one from someone else - Apple Support

Hey, hope you're doing well.

Is your Apple Watch second hand or was used by someone else before? If yes that would be the problem, when you link an Apple Watch you usually link it to your iCloud account. If it was reseted without the owners permission or given to you by a relative or friend, contact the previous owner and tell them to please un-link it from their iCloud account in order to the Apple Watch be able to be linked again.