The virtual device might be why.
Because of doing the streaming thing, with two computers, my mic goes to the Streaming PC, and then VoiceMeeter sends the mic audio to the Game PC over my network, where another copy of VoiceMeeter receives it via their VBan.
Am running two copies of VA, each with their own profile, where one PC controls music stuff, and the other controls game stuff.
It might be one of those I am SOL situations
I do get a dialog box to read out with the "train your computer to understand you better" option though