Apple Watch
How do I pair an Apple Watch with a different Apple ID??
Apple Watch
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What do you mean a different Apple ID?
Was this watch previously owned by someone else? If so, that is likely the Activation Lock that prevents lost or stolen Watches from being used by someone else.
If you don't know the original owner and get them to remove the Activation Lock, that watch will never work for you.
M1 Mac mini, macOS 11.4; Watch, series 5 GPS/cellular, watchOS 7.5; iPad Pro 2nd Gen, iPadOS 14.6; iPad Air 2, iPadOS 14.6; iPhone 12 Pro, iOS 14.6; TV 4th Gen, tvOS 14.6 HomePods, audioOS 14.6 and Airport Express w/ Airplay 2