Audio Mixer Bus won’t play more than one instance of a random container when attached to multiple game objects in Unity

Question

So I have a simple game where zombies spawn at random points in the unity game. However I would like to use google resonance within Wwise to create more in depth spatialization - this means putting the random container of zombie sounds through an audio bus with the resonance plugin attached to the audio bus.

Now, even though there are multiple zombies in the scene, only one of them is emitting the sound from the random container - it did not do this before I added the audio bus. How can I make multiple game objects create the same sound from the audio bus in the game scene?