How can I set system audio + microphone as the audio input for video conference software?
Usually, whenever you need to stream the audio from your PC, you only need the audio from a single programme, because otherwise also the incoming audio from your conference members in MS Teams would be streamed back to them as well. When you start screen sharing, or sharing a particular programme, there should be an option to share audio as well, at least this is how MS Skype works so I think Teams will do it similarly. So in order to share for example the audio from a video file, you can open it with whatever software you want, and then just share this software with the screen sharing option. I tried this with many different programmes and different hardware devices, and it always worked quite well, even if the video is just a random video from YouTube that I stream down over the web to my browser.