How to turn OFF the sound for Y Messenger on the iPhone App?

I have tried turning the 'sound' off in the Notification settings of the phone for the app but that does not turn off the "beep" sound that comes in every time a message comes in.

Did you also turn off the 'alerts' and 'badges'? I believe you have to disable it all to stop the beeping. Here's our article with steps:

Hope that helps!