How to remove Activation Lock from my Apple Watch?

Do you mean: “It’s locked to a different iCloud?”

In the case that your Apple Watch is Activation Locked, you will need the original owner of the Watch to unlock it or provide Apple with the proof of purchase receipt.

Learn more ⇢ About Activation Lock on your Apple Watch - Apple Support

-Zachyy ✌️

We'll need more information before we can provide any useful suggestions. This may help you craft a good query:

https://discussions.apple.com/docs/DOC-5931

Regards.