don't know if this will help anyone else but i had the same problem, notifications would show up but no sound. I went to sound/haptics and turned on Change with Buttons under Ringtone and Alerts. Worked for me. Good luck.
Cheylak37
Users receive reputation points by contributing quality content to the forums.
Posts include post and replies published on the forums.
Post authors can mark replies as Accepted to indicate successful solutions.
Apple Developer Forums admins can mark replies as Apple Recommended to indicate an approved solution
From
United States