We use Jitsi Meet for our video conferences (https://meet.jit.si) . Even when we use the latest version of Edge browser (Version 84.0.522.9), we notice that there is no option to share audio when we choose a video from "Application window". That option is visible for other 2 tabs - "Whole screen" and "Edge Tab". I guess this feature is not yet available. It is a very essential option for video conferences (to be able to share video with audio from Application window), please let me know if it is already being worked on and there is a Release date planned. If not, please consider this as a feature request.