Facebook app and Page Manager app

[diorsnow]

Hi. I am new to Android and been using iOS for the past years. I got all ny settings right for tbe notification sounds for Facebook and Pages Manager however I am nit hearing the sounds when someone sends a message in the Pages Manager or when there is activity in the Pages Manager. I think it worked jusymt once but now there is no sound anymore. I can just see the badge icons. Any idea?