Has anyone been able to successfully use a Rodecaster Pro II and vmix and bring in the various channels separately so I can an assign each one a Vmix input?

I basically want to do what vmix outlines in this support doc with my 2.

I have multiple Mics and audio set up in the Rodcaster Pro II and I want to place them each in their own input on vMix so I can better control the audio flow.

In vmix I was expecting to add audio input, choose Microphone (Rodecaster Pro II Main) and the below it choose the drop down menu you choose which audio device I wanted on that input. (like is shown in the above support page)

Alas, there is no way to select the individual input.

Thanks.