How to select an alert tone for notifications of different Organizations?
To select an alert tone
1. Open the Bigin app on your iPhone.
2. Tap the More 
icon at the bottom right of the screen.
3. Select Settings 
Under "General", you can find the title "Notifications".
4. Tap on Notifications > Sound.
5. In the screen that opens, tap on the "Alert Category dropdown
.
6. Select "By App".
Once you've selected the alert category, you can tap on "Sound" under "Alert Tone" to set the app's alert tone from the list of available sounds.