The sound seems to work just fine now.
No sound iOS app

The sound seems to work just fine now.

Well, I am glad to hear that you have solved your problem. When the app or the iOS device has no sound later, please first make sure some settings are right. Once the issue is caused by some iOS glitches or software bugs, you could use any iOS system recovery tools to fix it without data loss.
It has been like this for a week. I do not like to complain, decided to wait for this to be fixed, but it hasn’t been fixed.
How do I fix this problem?