Thanks for talking me off the cliff (though I guess that cliff had a huge tourist protection wall at the edge, haha!)I think this might be going a bit too far. iPhone Mirroring is a system app and cannot be uninstalled, and it's not in the App Store so you wouldn't be able to reinstall it anyway. macOS keeps its system data in a signed/sealed/read-only volume, and I believe it checks the integrity of it to make sure things are correct. I don't think any of those files would be the problem.
I just saw this thread, which gave me another clue for the final mystery I had.
~/Library/Group Containers/group.com.apple.UserNotifications/
I deleted that folder and rebooted. That made it forget which apps I had turned notifications off for, so this is where those particular settings are stored. Could try deleting that to see if it helps anything for you.
If it still doesn't, my thoughts would be to try the following (in no particular order):
- If you're wanting to go nuclear and deleting stuff, I would stay within your home folder.
- Sign out of iCloud, reboot, and sign back in (if you haven't already).
- Create a new Mac user account and see if it works there. If it does, I think that further shows that something's wrong within your original home folder. Either keep digging, or switch to using a new user account.
I tried the Group Containers folder deletion (interesting about it piling up junk) and that did nothing. And yes I already tried the sign in/sign out of iCloud.
BUT, yep, setting up an alternative account on my Mac sure as heck does cause notifications to work! Man...do I just...start anew? It's tempting actually but seems a bit daunting to customize everything all over. You're definitely on to something, and I suppose that's my nuclear option! Thanks as always!