I'm having the same issue on Samsung s20 ultra note. Apps will make their sounds. Incoming calls will make sound. All messenging apps I use will not notify upon incoming. Android messages, Google hangouts, Facebook messenger. When I select notifications within the app to make sure sound is turned on, it is. When I edit the sound setting to change the sound, no sound will play as I move from sound to sound. This is not normal as usually you will get a sound preview. I use the standard app for sound that came with the phone. Rebooting the phone did not resolve. I received an update in the past 4 days. Not sure if it was Samsung pushing an android update or a network update or what. This problem did not begin when I did this update. The only other item I've updates is the Samsung wearable app. It's like it thinks it's connected to my Samsung watch and letting it handle the notifications. I've disabled blue tooth, still same issue. No ideas what to try next.
... View more