I can't pair my Apple Watch with my Apple ID

If this is a used watch, the previous owner needs to log out of iCloud or go to https://www.icloud.com/find/ and erase the watch, then remove it from their account. If they won't do that, the dwatch is useless. Apple won't unlock it.

Turn off Activation Lock - Apple Support.     

If you are the original owner, contact Apple. Apple can remove the ID  if provided the required paperwork to include the original purchase receipt with the serial number on it. 

Request additional support for unlocking your device

See if anything here helps. 

Watch -  Set up your.    

Watch - Unpair and erase your.   

Watch - pair with a new iPhone

Watch isn't connected or paired with your iPhone