When you join a Teams meeting, you can choose to mute your mic to prevent any unwanted noise or unmute your mic to participate in the meeting.
There are a few different ways you can mute or unmute your mic in Teams.
Mute or unmute before a meeting
Before joining a meeting, you can turn your mic on or off by selecting the toggle next to Mic on the right side of your screen.
Mute or unmute during a meeting
To turn on your mic during a meeting, select Mic in meeting controls at the upper-right area of your screen. To turn off your mic, select Mic again to mute yourself.
You can also toggle your Mic on and off by pressing the shortcut keys Ctrl+Shift+M once. To learn more, see Keyboard shortcuts for Microsoft Teams.
Use Ctrl+Spacebar to unmute
On the Teams desktop app, you can also choose to stay muted to avoid unwanted interruption or noise during a meeting and rapidly respond when called upon. To quickly unmute, hold down the keys Ctrl+Spacebar (Windows) and Option+Spacebar (Mac). Release keys to go back to muted state again.
How to enable:
Go to Settings > Privacy. Make sure Keyboard shortcut to unmute is toggled on.
Join a call or a meeting. Mute yourself.
On Windows, press and hold Ctrl+Spacebar. On Mac, press and hold Option+Spacebar. You'll see an alert regarding temporary unmute. Check to make sure you're unmuted.
When you release the key combination, your mic will be muted again.
Note: Shortcuts in general—including Ctrl+Spacebar and Option+Spacebar to unmute—don't work within the chat box or when apps like PowerPoint Live or Whiteboard are shared in the meeting stage.
Want to learn more? See Meetings in Teams.