Watch unpaired incorrectly
My watch and phone weren’t pairing correctly. I tried to unpair my watch but got an error message that it unpaired incorrectly. I can’t pair it now.
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Ensure the iphone is on iOS16.4.1 or if you have iPhone 6S or 7 update to iOS15.7.5
Erase the Watch completely. Put your watch on its charger and keep it there until you complete these steps. (select the watch OS version) Erase Apple Watch – Apple Support (UK)
When pairing do not try to restore the backup, pair as a New Watch Set up your Apple Watch – Apple Support (UK)