Webcam Exposure continues to shift

[VelvetLounger]

I'm setting up my firs Zoom meeting with a friend to test out using my XT-2 as the webcam. The biggest glaring issue I have is that the exposure in the zoom preview screen keeps shifting brighter and dimmer. I am set to manual ISO, aperture, and shutter speed. Center weighted meter. And using number 2 preset on my autofocus. My lighting is is controlled and constant. Even if I don't move at all the exposure will jump. I would think this defeats the whole purpose of using a high quality camera as a webcam.

The focus seems to be fine, But the exposure jumps around like crazy. Has anyone else had this issue, and if so how have you solved it?

Thanks all!