Slack Huddle Audio or Mic Not Working? Get Heard Again

You join a Slack huddle and either can’t hear anyone, or no one can hear you.

Why: Almost always it’s the wrong input/output device selected, or Slack hasn’t been granted microphone permission by your operating system. There’s also a well-known Windows quirk where Slack ignores headsets that aren’t the system default.

Fix 1: Restart, then check your devices

1. Quit and reopen the Slack desktop app (or refresh the browser tab). If audio still misbehaves, restart your computer.
2. In a huddle, open the ⋮ (more) menu and go to your audio settings (or Preferences → Audio & video).
3. Confirm the correct Microphone and Speaker are selected — not a disconnected webcam mic or HDMI output.
4. Test your mic: speak a few words and watch the voice meter. If it doesn’t move, pick a different option from the microphone dropdown. Click Test on the speaker to hear a chime.

Fix 2: Grant Slack microphone permission

If the meter never moves, check operating-system permission as well as the selected device and mute controls.

On macOS:

1. Open System Settings → Privacy & Security → Microphone.
2. Find Slack in the list and turn its toggle on.
3. If it’s already on, toggle it off and back on, then fully quit and reopen Slack.

On Windows 10/11:

1. Windows 11: open Settings → Privacy & security → Microphone. Windows 10: open Settings → Privacy → Microphone.
2. Enable Microphone access (or Allow access to the microphone on this device) and app access.
3. For the Slack desktop app, also turn on Let desktop apps access your microphone on Windows 11, or Allow desktop apps to access your microphone on Windows 10. Traditional desktop apps do not have an individual Slack permission toggle in this list.
4. If Windows presents your Slack installation as an app with its own permission toggle, enable that too. Fully quit and reopen Slack, then test the mic again.

Fix 3: Fix the Windows default-device issue

There’s a known Windows issue where Slack can’t use a headset unless it’s set as the system default:

1. Right-click the speaker icon in the taskbar and choose Sound settings (or open Settings → System → Sound).
2. Under Choose where to play sound (output) and Input, set your headset/mic as the device.
3. For older builds, open the classic Sound control panel, right-click your device on the Recording and Playback tabs, and choose Set as Default Device / Set as Default Communication Device.
4. Rejoin the huddle. Also confirm your audio drivers are up to date.

FAQ

Audio works in other apps but not Slack. Recheck Slack’s selected input, its mute state, and the permissions in Fix 2. On Windows, check the desktop-app access switch rather than looking for a per-app Slack toggle; working in another app does not identify the cause by itself.

I can hear others but they can’t hear me. Your speaker is fine, so it’s a mic problem: confirm you’re not muted in the huddle, the right microphone is selected (Fix 1), and Slack has mic permission (Fix 2).

Does the browser version need anything extra? Yes — your browser must allow microphone access for Slack. Click the mic/lock icon in the address bar and set Slack to Allow.

Sources: Slack Help Center — Troubleshoot audio and video issues in Slack · Slack Help Center — Adjust your huddles preferences · Microsoft Support — Windows microphone permissions