Checking this again after your comment @Kerr, Cecile , I find that from the Stream UI, for a video I recorded in Teams, I can click the three dots by the "copy to" button, and download and for me the video does now download as mp4
Checking this again after your comment @Kerr, Cecile , I find that from the Stream UI, for a video I recorded in Teams, I can click the three dots by the "copy to" button, and download and for me the video does now download as mp4