Notification Sound Previews are not working

[beyondinfinity]

II tried changing the notification sounds for several apps like mail, but the preview of the sound is not working. So basically I am unable to preview what it sounds like before deciding to keep it. When you push the play button on the left side of the sound name, nothing happens , even though I have my volume for media/apps turned on as well as ringer/notification volume turned on.

I'm running Windows 10 mobile build 10586, on a Lumia 1520