This is on a fresh install of Nobara, got KDE connect connected to my android phone. I can send messages, recieve them, and get the notifications from phone onto the KDE connect app. I also get all of the notifications for apps, calls and so forth regarding the phone. 

However, the sounds I've set up for them in KDE connect will not play for the notification for both calls and sms messages. The Play sound is checked on for both messages and calls. Testing the audio file also works correctly. When testing for messages and calls, I'll see the notification on the desktop, sound will not play. I tried switching between a few of the other audio tracks, and confirming I had hit apply to confirm changes. Still no sound pops up.

What's also odd, is that notification sounds from my native desktop sounds do work properly. It's just KDE connect's sounds not working.