Dynamic Audio Volumes - "Make Interior Settings"


I cant seem to get the new “make ambient settings” function to work correctly in 4.7.1

I am trying to dynamically change the interior audio volume and filter settings when a door is opened and closed but the below blue print doesn’t seem to work whilst simulating in the editor.

I may be overlooking something simple, but I thought I ought to raise this since it is fairly new functionality.

Any support would be gratefully received.