We are happy to announce this feature is released on Windows. We are working on support for Mac and will update as we have more details.
Please refer to this page for more info on this feature: https://support.office.com/article/share-system-audio-in-a-teams-meeting-dddede9f-e3d0-4330-873a-fa061a0d8e3b.Duane commented
We have struggled with this as well. With all the great video content being produced by a variety of sources, it is great to be able to share with remote team members in a view/discuss kind of format. Trying to get everyone to start/stop in unison on their own instances is not very workable.