Apple has six hours of my life that I'll never get back trying to resolve this. Four hours on the phone and two hours in the store. The store representative ACTUALLY said, 'iPhone and Mac normally do not connect using bluetooth'. Well, I've been connecting (and using and needing) this bluetooth connection for years. Five Apple representatives and they don't have a clue. To their defense, they reset everything they could. BTW, if you think you can just go back to Big Sur to get your Bluetooth back, it isn't so easy. Good luck everyone!