RegisterBusVolumeCallback Bug?

Question

So I was trying to have the ability to change the bus mix in our custom game engine. I came across a weird issue.

I call RegisterBusVolumeCallback and pass in the bus ID and my callback function. When I start the application and if RegisterBusVolumeCallback is called it does not output anything (volume) from the bus I pass in.

For debugging the issue, I commented out everything in my callback function and it still does not output anything (volume).

Comments

Here is the link to the documentation of the function.

https://www.audiokinetic.com/library/2015.1_5418/?source=SDK&id=namespace_a_k_1_1_sound_engine_a48a069a39cd20d04fbbd8782df3ee386.html

AKRESULT __cdecl AK::SoundEngine::RegisterBusVolumeCallback    (    AkUniqueID     in_busID,
AkBusCallbackFunc     in_pfnCallback     
)

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did you take a look at the example here:
https://www.audiokinetic.com/library/2015.1_5418/?source=SDK&id=goingfurther__speakermatrixcallback.html

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also make sure you do not call RegisterBusVolumeCallback with the Master Audio Bus, and ensure you place an effect plug-in on your bus.