Can’t pair my series 7 watch with my iPhone 13 pro

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Set up your  Watch -

Set up your Apple Watch - Apple Support

M1 Mac mini, macOS 13; Watch, series 7 GPS/cellular, watchOS 9.1; iPad Pro 2nd Gen, iPadOS 16.1; iPhone 12 Pro, iOS 16.1; TV 4th Gen, tvOS 16.1; HomePods, audioOS 16.1 and Airport Express w/ Airplay 2