Need help connecting my old Apple Watch and changing ID on old Apple Watch
iPhone 11, iOS 15
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Remove Watch Activation Lock -
Go to icloud.com and login
Open Find iPhone.
In the All Devices pulldown menu select your Watch.
In the resulting sheet that appears to the right choose erase Apple Watch. Select Next until the device is erased.
Then Remove the watch from your Apple ID.
This should reset the watch to the factory settings for you to setup as new and pair it to your iPhone.
You can restore the watch from a previous backup if you have one.
M1 Mac mini, macOS 12.5; Watch, series 5 GPS/cellular, watchOS 8.7; iPad Pro 2nd Gen, iPadOS 15.6; iPhone 12 Pro, iOS 15.6; TV 4th Gen, tvOS 15.6; HomePods, audioOS 15.5.1 and Airport Express w/ Airplay 2