How can I deactivate the security block on my Apple Watch?

Request additional support for unlocking your device -

https://al-support.apple.com/#/additional-support

If you can't gain access to the Apple Account that paired the watch to the phone, take the watch and your original receipt showing the watch’s serial number, plus your photo ID to an Apple Store and request that they remove the Activation Lock for you.

M1 Mac mini, macOS 15.3.1;  Watch, series 10 GPS-only, watchOS 11.3.1; iPhone 16, iOS 18.3.1; TV 4th Gen, tvOS 18.3; HomePods, audioOS 18.3 and Airport Express w/ Airplay 2

The Genius Bar at an Apple retail store or an Authorized Apple sales location.

same I can’t update my watch I can’t connect alos