Here's my setup..

I want to be able to monitor audio and send that audio to the MS Teams mic input at the same time.

Audio Bus A: outputs to Cable Input (VB-Audio Virtual Cable)
Audio Bus B: outputs to Headphones

Routing an AutoMixer with 6 mic inputs and a video with audio to both Audio Bus's.

In Microsoft Teams I have the same Headphones set as Speakers. And for Microphone Input I'm using the Cable Output (VB-Audio Virtual Cable).

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When I only have Audio Bus A enabled, my microphone comes through loud and clear to whoever I'm speaking to.

When I have both Audio Bus A and B enabled, my microphone does not come through. Or they will only hear tiny bits of my voice. But I can hear all audio from VMIX through the monitor Bus. (Audio Bus B)

Any ideas? Am I making a simple mistake?

Thanks!