My watch won’t pair
I have a iPhone 7 Plus and my when I go to pair it it goes normal then it unpairs
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It sounds like you are trying to pair your iPhone 7 Plus to a watch that is running watchOS 9; apparently you bought one of the latest models (SE 2nd Gen, Series 8, or Ultra).
If it's not one of those, and you bought a used one that is capable of running watchOS 9, and has been updated to watchOS 9, it's not going to pair. You need to update your phone to an iPhone 8 at LEAST.