Preparing and configuring the Chroma Key before adding the background screens
Microsoft Teams does not have Chroma Key recognition like Zoom.
In Zoom, we click on any part of the green background screen so that the program chooses the best configuration. After that, we chose a background screen, so that the quality is excellent, without those green "fins" between the fingers.
So my suggestion is the previous configuration for Chroma Key recognition in Microsoft Teams like the Zoom does.