Hi
Activation Lock prevents unauthorised use of Apple Watch if it is lost or stolen.
If the watch is locked to your own account, but you are having issues with your credentials:
It may help to follow the instructions here:
If you still need assistance, contact Apple Support or make a Genius Bar reservation, taking along your Apple Watch and your original proof of purchase for it:
- Contact - Official Apple Support
- https://twitter.com/applesupport
- http://www.apple.com/retail/geniusbar/
More information and instructions: