How to remove betas from an unpaired Watch

Follow the steps for removing Activation Lock.

Removing Activation Lock -

https://support.apple.com/en-us/HT201441

ASC - Late 2012 Mac mini, macOS 10.14.6; Watch, series 5 GPS/cellular, watchOS 6.2; iPad Air 2, ipadOS 13.5.1; iPhone 8+, iOS 13.5.1; TV 4th Gen, tvOS 13.4.6;  HomePods, audioOS 13.4.6 and Airport Express w/ Airplay 2