Auro3D headphone not working in Unity

Question

Hi, this is my hello world session.

I managed to get audio playing without auro headphone in the signal(bus structure)

I routed a 3rd order ambisonic file to a auro bus as per tutorial.

when i preview in Wwise I can hear the sound.

when I push the sounbank to unity everything works just fine.

I've attached the sound event to a sphere and the ak listener to the min cam.

When I then insert the Auro3D headphone plug in to the bus, save and push the soundbank, refresh unity etc. I get no sound.

please adive

Greets Stefan