Facebook messenger incoming sound

[Exalted]

I don't know why but I lost facebook messenger. I reinstalled but I lost the sound when I receive a sms message.
How can I recover a incoming sms sound Thanks

 

[B. Diddy]

I don't use FB Messenger, but open it, tap Menu>Settings, and see if there's an option there for Notifications, where you can select which tones to play.