TL;DR: DND wouldn’t silence calls/notifications. I didn’t touch a single setting in DND nor did I have any shortcuts in use. It was as if you took a new iPhone out of the box, turned on DND and it literally nothing.
To fix I had to completely erase my iPhone and not restore any data from iCloud.
So my issue with DND (on iOS 16-16.2 on a
iPhone 14 Pro Max) was that while DND was on, it would still play notification sounds for every single app. It would still allow calls through with sound.
Bear in mind that I did not have any shortcuts in use, i didn’t even setup the focus. I didn’t change any settings in DND,
and it was at default. It was as if you took a new iPhone out of the box, turned on DND and notification alerts and call ringtones played at normal volume.
Literally the only thing changed by engaging DND was that it made the lock screen darker.
I tried various suggestions here and others I found online and none worked. I decided to completely erase the iPhone (save for the eSim). I decided to restore from a recent iCloud backup because I didn’t want to spend over an hour downloading all my apps, signing into everything and then setting up my home screens, widgets and settings, etc.
I was told by an store employee in the past that if you erase and restore from an iCloud backup that software bugs wouldn’t come back. This was inaccurate, as I had assumed. But I trusted him since he works for the company.
So I made a last ditch effort. Completely erase the iPhone, again, and this time don’t restore any data, or iCloud backups.
This fixed DND in iOS 16.2 for me.