watch
How to unlock Apple Watch if you forgot your username and password?
Apple Watch SE
User profile for user:
Community User
You can ask apple to remove the activation lock online on this page;
Online Activation Lock Removable Here.
Or this;
If you can't remember/gain access to the apple id that paired the watch to the phone.Take the watch and it's receipt with the serial number along with some photo id and any other proof of ownership to an Apple Store and request that they remove the Activation Lock for you.