Teams shortcuts not working? Why Ctrl+Shift+M and others do nothing

Most people look up this problem in the middle of a meeting: Ctrl+Shift+M does not mute, Ctrl+Shift+O does not turn off the camera. The usual cause is not a broken shortcut but where the keys go. Here are the causes in the order they usually turn up.

1. Teams is not the active window

This is the big one. Teams shortcuts work only when a Teams window is in front. Microsoft's support pages say it directly for Ctrl+Shift+M: the mute shortcut works when Teams is the active window. If you are in a document, a browser or the slides you are presenting, the keys go to that program.

Fix: click the meeting window first, then press the shortcut. During a meeting, Windows 11 can also show a microphone icon in the taskbar; clicking it mutes and unmutes without switching windows.

Watch for two windows: a meeting can open in its own window while the main Teams window stays open too. Shortcuts for meeting controls need the meeting window, or at least Teams, in front.

2. You are in Teams in a browser

Teams on the web runs inside Chrome, Edge or Firefox, and the browser keeps some keys for itself. Microsoft's list of Teams shortcuts shows separate keys for the web app for some actions for this reason.

Check: look at the window title and the address bar. If you see a browser, open Microsoft's list of Teams keyboard shortcuts and use the web column, or use the desktop app.

3. Find the right shortcut for your version

Shortcuts change with the version of Teams and with whether you are in a meeting, a chat or a call. Teams can list them for you: press Ctrl+Period in Teams to open the list of keyboard shortcuts. Compare what you press with what it shows.

The meeting shortcuts you probably want, for Teams on Windows:

Ctrl+Shift+M: mute and unmute.
Ctrl+Shift+O: camera on and off.
Ctrl+Shift+K: raise or lower your hand.
Ctrl+Shift+E: share screen.
Ctrl+Shift+H: leave the meeting.
Ctrl+Shift+S and Ctrl+Shift+D: accept and decline a call.

In the desktop app you can also stay muted and hold Ctrl+Space to talk briefly, which avoids the mute toggle altogether.

4. Windows uses Ctrl+Shift to switch the keyboard layout

Every Teams meeting shortcut starts with Ctrl+Shift. Windows can be set to switch the input language with Ctrl+Shift as well.

Check: go to Settings > Time & language > Typing > Advanced keyboard settings > Input language hot keys. If Between input languages uses Ctrl+Shift, every Teams shortcut also changes your layout, and the two can get in each other's way.

Fix: change the hotkey to Left Alt+Shift, or turn it off and use Win+Space to switch layouts.

If a shortcut fails right after a layout change, for example to a Cyrillic layout, switch back with Win+Space and test again. That tells you quickly whether the layout is involved.

5. Another program took the shortcut

Ctrl+Shift combinations are popular. Screen recorders, clipboard managers, other meeting apps and graphics driver panels can register them system-wide, and then Teams never sees the keys.

Check: close tray programs one at a time and test after each. Pay particular attention to other meeting apps running in the background, since they tend to use the same kind of shortcuts.

6. Teams is stuck

Teams sometimes stops responding to keys while the rest of it works. Microsoft's own advice for temporary problems is to quit and restart Teams.

Fix: right-click the Teams icon in the notification area and choose Quit, then start it again. Closing the window with X is not enough, because Teams keeps running in the background.

RadialDeck is the radial menu for Windows that we make. When Teams is in front, the same hotkey opens a Teams ring with 10 actions from the gallery: Mute, Camera, Raise hand, Share screen, Leave, Accept call, Decline call, Admit from lobby, Search and New chat. Each slice sends the default Teams shortcut, so you do not have to remember whether hand is K or H.

What it does not change, precisely:

Cause 1 still applies. RadialDeck sends the keys to the window that was in front when you opened the ring. If you open the ring over Teams, the keys go to Teams. If you open it over your slides, you get the ring for that program instead, and its keys go to the slides. A ring is not a global mute button.
Causes 4 to 6 still apply. The ring presses Ctrl+Shift+M as your keyboard would. If Windows uses Ctrl+Shift for layouts, if another app took the keys, or if Teams is stuck, the ring is blocked too.
What it helps with: finding the right action fast, in the middle of a call, with one flick.

The gallery's recipes are for the new Teams app. All Teams actions are on the Teams page.