apple watch pairing
How to pair my apple watch to a new phone when my apple password is not the original one from when purchased
Apple Watch Series 5, watchOS 8
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You have to unpair and erase watch and remove Activation Lock
From a web browser,sign in to iCloud.com with your Apple ID.
Go to Find iPhone.
Click All Devices at the top of the screen.
Click your Apple Watch.
Click Erase [device]. Select Next until the device is erased.
Click Remove from Account.
to unpair your watch from the old phone;
Then;
Setup your Watch to a new iPhone