Enable Audio Mixer 4.23 Mac

So I am working on a Mac and have been trying to make the reverb work in UE 4.23, and I can’t get it to work, so I wanted to try something different for the reverb solution. I therefore wanted to try the Steam Audio plugin, but it requires me to enable the Audio Mixer.

If anyone knows how to enable the Audio Mixer on UE 4.23.1 on Mac, it would be very much appreciated. As I understand it, this function is already enabled on UE 4.24, but the project I’m workin on is being developed on 4.23.