Actor Audio component has no sound with attenuation?

I have a campfire Actor.
It has an audio component which plays fine by default. When I turn on Override Attenuation there’s no sound. Everything should be default settings. Am I missing something? Should it not just work at that point?
The sound wav is mono.

Oh it needs to be a Cue and with looping checked. A direct Sound Wave doesn’t work. I didn’t find the answer anywhere else so I’ll just put this here.