August 2019:
Up until now (well, yesterday in my experience, it has not been possible to share your “system audio” when sharing or presenting content such as a video or PowerPoint from within a #MicrosoftTeams meeting. A new update in in Teams which is rolling out “now” (mine “switched on” yesterday” now lets you do just that!
This feature is easily missed but you can spot it (and enable) it from the share try tab when in a teams Meeting. When sharing content (such a application or your screen, simply tick the “include system audio” and you are good to go.

A couple of things…
…you need to check to make sure this works though
First, you need to ensure your Windows audio device is the same as your audio device in Teams. So if you hear the audio from other participants in your headphones you have to make sure that your Windows system sound is played to that device too.
If you don’t have the same audio device selected in Teams and in Windows you will likely see the error below.

Secondly – if you have already stared a sharing session and forgot to enable the system audio, you can enable this “mid-sharing” by clicking the icon in the top control bar. To do this, simply move your mouse to the top of the screen and it should appear, select “Include system audio” by clicking on the button.

What about Live Events?
Right now, from my initial testing anyway, sharing system audio does not work with Live Events which is odd. I’ve seen nothing specifically about this in the Teams Road map but i suspect this is something that will be addressed in time.
Thanks for Reading.
Rob




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