Wwise as a "screen off" media player? (iOS/Unity)

Question

Based on the Wwise documentation on Audio Sessions, it would seem that all I need are these settings active in Unity - and (after confirming the plist is properly adjusted in Xcode) that should allow me to continue hearing Wwise audio when I lock the screen.

That doesn't seem to happen, however. This doesn't seem to bring me any mileage in regards to getting audio to playback after I've locked my screen. I do, however, get a notification asking to use the microphone, and a "red bar" at the top of iOS indicating that the application is recording, which is not my intent.

Has anybody else gone down a similar path? Thanks in advance, for any insight.