When trying to turn on the option to unlock my iPhone with my watch I get a communication error. iPhone on iOS 15.1 and watch on 8.1. Both connected as re-paired a number of times and alerts being received on both.
anyone found how to fix this?
iPhone can’t communicate with Apple Watch
It seems to be an ongoing issue with the iPhone 13 at the moment, it's been reported on Reddit a decent amount, then picked up by tech news outlets. There's nothing you can really do until its fixed, but I'm sure that will be soon.