Share sound from your computer in Microsoft Teams meetings or live events
You can include audio from your device while you're sharing content in a meeting. You'll want to do this if you're playing a video as part of a presentation, for example. Read on to learn how.
Include computer sound
To share sound from your computer:
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Select Share
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Turn on the Include sound toggle.
When you share, all audio from your computer, including notifications, will be heard by participants in the meeting.
Note: Teams and your computer need to be set to the same speaker. Adjust your computer’s audio output in your system settings, and your Teams audio output in your device settings in Teams.
On a Mac, you'll need to install a driver the first time you include computer audio in a Teams meeting. Just follow the simple wizard and select Install or Update. It takes about 10 seconds for the installation to complete.
Once the driver is installed on your Mac, you'll see a notification at the top of your meeting controls. You might need to pause or play your video content to start sharing sound, or try turning on the Include sound toggle in Share
You can also choose to include sound (or stop including it) after you've already begun sharing your screen. Just hover over You're sharing your screen at the top of the window you're sharing and select Share audio 
Select Share audio 
Include computer sound in a room with a Teams device
Teams devices allow you to share content using cables connected to the room console. Unfortunately, we don't yet support sharing computer sound this way.
If you want to share computer sound when you’re in a meeting room with a Teams device in it:
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Join the meeting from your personal device by selecting Audio off when you join the meeting, which will automatically mute not only your microphone but also any audio playing from the Teams meeting to prevent echo.
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Select Share
Notes:
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To avoid echo, remember to keep only one device’s mic and speaker on in a room.
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Try to minimize the number of apps you run while you’re sharing your system audio. If your computer is running too many apps, your audio could suffer.
Troubleshooting
Poor audio quality
If your computer is running a lot of applications, you may experience issues with sound quality, like lagging or cutting out. If this happens, closing other applications can help.
Low volume
If you’re using Windows, other sounds from your device (like notifications and alerts) are reduced in volume when you join a Teams meeting. Most of the time, that’s probably what you want so you can focus on the meeting. But if you’re sharing computer sound, the same setting that quiets other system sounds will also quiet the audio you’re trying to share.
To fix this, go to your system's sound settings, find your Sound Control Panel, select Communications and then Do nothing. Finally, apply the changes so others will be able to hear your shared audio loud and clear.
Include audio from your mobile device
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Tap More options
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Turn on the Audio toggle.
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Tap Share screen > Start Broadcast.
Everyone in the meeting will now hear the audio from your device, and you'll see a notification on your screen confirming it.
Note: This feature is only available on devices running at least Android 10 or iOS 13.
Share audio from a web browser
To share your audio in a meeting on Teams for web:
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Select Share Tray > Screen, window, or tab to open the screensharing selection window.
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While sharing tab, select the Share Tab audio checkbox. This will share the audio coming from the tab.
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While sharing entire screen, select the Share system audio checkbox to share the audio coming from the entire computer.
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When you share tab audio, only the audio coming from the tab will be shared. Audio coming from the rest of the computer will not be shared.
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When you share system audio, all the audio coming from the entire computer will be shared.
To stop sharing the sound from your tab or computer, select stop screensharing.
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