After finish pairing the watch and my iPhone, I had to fill in my Apple ID but the watch didn't accept it. It said "my email cannot be used to unlock this Apple Watch".
Can anybody please tell my why? Is it my Apple ID's fault or something's wrong with the watch? My Apple Watch I bought in the US and I am setting up the watch in Vietnam btw.
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Apple Watch, watchOS 2.1, null
It would appear to me that your watch has already been set up by someone else, and is still paired to their device. It has Activation Lock on. Did you purchase this watch new, or was it a used device you purchased from an individual? If used, you need to contact that individual to have them remove the device from their account to allow you to activate it.
See this information to share with the former owner of the watch to remove Activation Lock. About Activation Lock on your Apple Watch - Apple Support
When I set up my Apple Watch, My watch doesn't accept my Apple ID.
