To share sound from your computer, select Share content in your meeting controls and then Include computer sound.
When you share, all audio from your computer, including notifications, will be included in the meeting.
For more details, please refer to this article: https://support.microsoft.com/en-us/office/share-sound-from-your-computer-in-a-teams-meeting-or-live-event-dddede9f-e3d0-4330-873a-fa061a0d8e3b.
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