I had tried this several times. However, on my S8 Plus it showed inside the Message settings that it was turned on. Finally by chance I went into Settings/Notifications - and to right is ‘Advanced’. Takes a sec to load, then scrolled down to ‘Messages’ and here it showed as ‘blocked’!!! However this still didn’t work, so I went into Sounds and Vibrations/Sound mode was on mute. Also in same area, pressed ‘volume’ and it was turned down. Crazy that so many different places to adjust the sound of an app!
Happening to me and my wife on our S8's on Verizon. All messaging apps exhibit this behavior. Phones have been reset to factory defaults.
The issue is resolved temporarily after a restart, but the issue returns several times a day. All options and YouTube video suggestions have been tried with no success.
Please fix this, Samsung!