No message notifications on iPhone 13 Pro; IOS 15.7; MySudo 1.18.0

Hello.

I want a sound notification only for my iPhone 13 Pro, running iOS 15.7. I have the "Pulse" sound turned on for messages in the MySudo settings. In IOS notificatiions settings, I have Sound notifications enabled. In IOS settings, I have "Background App Refresh" turned on for MySudo. I never hear anything when I receive a text.

I have this exact setup for TextMe and it works well. But, I want to swich to MySudo.

Thanks for your help.