Slack has revolutionized remote work and eased workflows. One of the most common issues is that Slack notifications are not working. When Slack is not sending notifications, the issue is usually tied to the wrong notification settings, blocked app notifications, Focus or Do Not Disturb modes, or a stuck Slack app.
If you are busy with one channel or working in another tab, then notifications help to know other messages. One incorrect toggle can stop you from seeing new messages or receiving alerts altogether.
Let’s start with a two-minute checklist that resolves most cases, then move to device-specific fixes for Mac, Windows, iPhone, Android, or desktop if the issue persists.
Quick Fixes — Try These First (Under 2 Minutes)
If you are not getting Slack notifications, try these five steps. They solve the majority of Slack muted channels problems:
- Check for paused notifications in Slack. Click your profile picture in the sidebar. If you see a snooze icon or the text 'Notifications paused,' click it and select Resume notifications.
- Check that the channel isn't muted. Click the channel name at the top. Open the Notifications dropdown and make sure it isn't set to Mute.
- Check your OS notification permission for Slack. On Mac: System Settings > Notifications > Slack > Allow Notifications ON. On Windows: Settings > System > Notifications > Slack: ON.
- Fully quit Slack and reopen it. Don't just close the window — on Mac, right-click the Dock icon and choose Quit. On Windows, right-click the taskbar icon and choose Quit.
- Restart your device. A restart clears stuck system states that prevent notification delivery.
If these steps didn't resolve the issue, move to the section below that matches your device.
Why Are My Slack Notifications Not Working?
Slack notifications are controlled at multiple levels, so one incorrect setting can stop alerts completely. The problem may come from your account preferences, a muted channel, workspace-level settings, or your device blocking notifications.
The most common causes include:
- Slack’s in-app notification settings: Notifications can be paused, limited to mentions only, or disabled for specific Slack channels, workspaces, or your entire account. A muted channel or incorrect notification preference is one of the most common reasons users stop receiving alerts.
- OS-level notification permissions: macOS, Windows, iPhone, and Android require apps to be granted permission to send app notifications. If Slack loses access in your device settings, notifications will not appear.
- Focus, Do Not Disturb, or Quiet Hours: Modern operating systems route alerts through Focus or Do Not Disturb settings. If Slack isn’t included in the allowed apps list, notifications and sounds may be silenced.
- Corrupted or overfull cache: A bloated cache can cause delayed notifications, stuck badges, unread messages, or syncing problems between desktop and mobile devices.
- Outdated Slack app or operating system: Older versions of the Slack app or your operating system may stop working correctly after updates.
- Network or Slack service issues: Weak internet connections, VPNs, firewalls, or temporary Slack outages can delay or block notifications entirely.
Fix Slack Notifications Not Working on Mac / MacBook
Mac and MacBook users commonly experience Slack notification issues because macOS notification settings vary between versions.
If Slack notifications are not working on your MacBook, follow the steps below to fix the issue.
1. Check macOS Notification Permissions for Slack
- Open System Settings (macOS Ventura and later) or System Preferences (macOS Monterey and earlier) and go to Notifications.
- Scroll down and click Slack.
- Make sure Allow Notifications is turned ON.
- Set the Slack alerts style to Banners or Alerts (not None).
- Make sure Play sound for notifications is checked.
Note: On macOS Ventura and later, the panel is called System Settings. On Monterey and earlier, it is System Preferences. The steps are the same — only the name differs.
2. Turn Off Do Not Disturb and Focus Modes
macOS Focus modes are the most common hidden culprit on Mac. A Focus can be active without any obvious indicator.
- Click the Control Center icon in the menu bar (top right).
- Click Focus. If any Focus is highlighted or active, click it to turn it off.
If you need a Focus mode for work but still want Slack notifications:
- System Settings > Focus > [Focus name] > Allowed Apps > click + and add Slack.
3. Check Slack's In-App Notification Preferences
Make sure Slack’s in-app notifications are turned on and not paused or incorrectly configured.
- Click your profile picture in the sidebar and select Preferences.
- Under How to notify you, make sure Desktop notifications are checked to turn on Slack notifications.
- Under what to “notify you about,” choose everything or Mentions and direct messages, depending on your preference.
- Scroll down to Sound & appearance and confirm a sound is selected (not None). Click Show an example to send a test notification.
4. Fix Slack Not Appearing in macOS Notification Preferences
If Slack doesn't appear in the Notifications list in System Settings at all, this is a known macOS edge case — often triggered after reinstalling Slack or upgrading macOS (including macOS Big Sur).
- Quit Slack completely and reopen it.
- If it still doesn't appear, open Activity Monitor, search for 'user noted,' select it, and click Force Quit to restart the notification daemon.
- If the problems with Slack persist, uninstall Slack and reinstall from Slack.com/downloads or the Mac App Store.
Note: There are two versions of Slack for Mac: the Mac App Store version and the direct download from Slack's website. Switching between them sometimes resolves persistent notification bugs. If you installed from one source, try the other.
5. Clear Slack's Cache on Mac
If everything looks correct but you’re still not receiving notifications, try clearing Slack’s cache on Mac.
- In Slack, click Help in the menu bar.
- Select Troubleshooting, then click Clear Cache and Restart.
- Slack will restart automatically with a clean cache.
6. Reinstall Slack on Mac
- Drag Slack from your Applications folder to the Trash.
- Download a fresh copy from Slack.com/downloads or the Mac App Store.
- Sign in and test notifications.
Fix Slack Notification Sound Not Working (Mac & Windows)
Slack can deliver notifications perfectly — banner appears, badge updates — but you hear nothing. Sound issues have their own set of causes separate from notification delivery, so they're worth troubleshooting on their own.
On Mac
Step 1: Check macOS notification sound settings for Slack
- Open System Settings (macOS Ventura and later) or System Preferences (Monterey and earlier). Click Notifications tab.
- Scroll down and select Slack.
- Make sure Play sound for notifications is turned on.
If this toggle is off, Slack notifications will appear silently — no sound, even when everything else is working.
Step 2: Check your Mac's audio output
- Go to System Settings → Sound (or System Preferences → Sound on older macOS).
- Under the Output tab, confirm the correct device is selected — usually MacBook Speakers or your headphones.
- Make sure the output volume slider is not at zero or muted.
- Check that "Play user interface sound effects" is enabled.
Note: If you use an external monitor connected via HDMI or a USB-C hub, macOS sometimes automatically switches your audio output to the monitor — even if the monitor has no speakers or low-quality ones. Disconnect the monitor and test whether the notification sounds return. If they do, go to System Settings → Sound → Output and manually set your preferred audio device. You'll need to re-check this any time you connect or disconnect an external display.
On Windows
Step 1: Enable notification sounds for Slack in Windows settings
- Click the Start menu and open Settings.
- Go to System → Notifications.
- Scroll down and find Slack in the app list.
- Click on Slack to expand its settings and confirm that " Play a sound when a notification arrives is turned on.
If this is off, Windows suppresses all sounds for Slack notifications regardless of what Slack's own settings say.
Step 2: Check Focus Assist and Quiet Hours
- Go to Settings and click on “System.”
- Now Choose “Focus”.
- Make sure it is set to Off. If it's set to Priority only or Alarms only, Slack sounds may be suppressed.
In the Slack App Itself
Even if your OS settings are correct, Slack has its own sound controls that can override everything.
- Click your profile picture in the sidebar.
- Select Preferences, then click Notifications.
- Scroll down to Sound & appearance.
- Check the drop-down next to New messages — if it says None, no sound will play. Select any sound from the list.
Fix Slack Notifications Not Working on iPhone
1. Check iOS Notification Permissions
The first place to check is your iPhone's notification settings for Slack. iOS can revoke or restrict app permissions after an update, and Slack won't warn you when this happens.
- First, open your iPhone's Settings app. Scroll down and tap Notifications.
- Scroll through the app list and tap Slack.
- Make sure Allow Notifications is switched on, enable Sounds, Badges.
2. Turn Off Focus Modes on iPhone
Focus modes are one of the most overlooked reasons iPhones stop showing Slack notifications.
- Open Settings and tap Focus.
- Look at the list of Focus modes — Do Not Disturb, Work, Personal, Sleep, and any custom ones you've created.
- If any Focus shows as active (you'll see it highlighted or with a green indicator), tap it.
- To turn it off completely, tap the green toggle at the top.
- If you want to keep a Focus active but still receive Slack notifications, tap the Focus name, then tap Apps under Allowed Notifications.
- Tap the + button and search for Slack, then add it to the allowed list.
Tip: You can also check whether a Focus is currently active from your Control Center — swipe down from the top right of your screen and look for a Focus icon near the top.
3. Enable Push Notifications Inside Slack
Even if iOS is set up correctly, Slack has its own notification switch inside the app.
- Open the Slack app and tap your profile picture at the top right.
- Tap Notifications.
- Make sure mobile push notifications are turned on.
- Tap Notify Me on Mobile and set it to As soon as I'm inactive for the fastest delivery.
4. Run Slack's Built-In Notification Diagnostic
If notifications are still not arriving after the steps above, Slack has a built-in diagnostic tool:
- In the Slack app, tap your profile picture > Notifications.
- Tap Troubleshoot Notifications.
- Tap Send a report. Include a brief description of the problem and send it to Slack's support team.
5. Reinstall the Slack App on iPhone
- Press and hold the Slack icon and tap Remove App > Delete App.
- Reinstall from the App Store.
- Sign in and test notifications.
Fix Slack Notifications Not Working on Android
1. Check Android App Notification Permissions
- Go to Settings on your Android device
- Tap Apps & permissions → App Manager
- Find and select Slack from the list
- Open Notifications and turn on Allow notifications (enable sounds too)
2. Turn Off Battery Optimization for Slack
Battery optimization is the number one cause of delayed or missing Slack notifications on Android. When aggressive battery saving is enabled, Android can restrict background processes — including Slack's connection to its push notification service.
- Settings > Apps > Slack > Battery.
- Select Unrestricted or toggle on Allow Background Activity (wording varies by Android version and manufacturer).
3. Confirm Google Play Services Notifications Are Allowed
- Go to Settings on your Android device
- Tap Apps & permissions → App Manager
- Find and select Google Play Services from the list
- Make sure notifications from Google Play Services are enabled. Slack uses Play Services for push notification delivery on Android.
4. Use Slack's In-App Diagnostic Tool
- In the Slack app, tap your profile picture > Notifications.
- Tap Troubleshoot Notifications, then follow the on-screen steps.
- Tap Send a report if the diagnostic finds an issue, so Slack's support team can investigate further.
Fix Slack Notifications Not Working on Windows
1. Check Windows Notification Settings
- Click the Start menu > Settings > System
- Scroll down and click on “Notifications.”
- Make sure Get a notification from apps and other senders is ON.
- Scroll down to find Slack in the list and confirm notifications are enabled.
2. Turn Off Focus Assist / Do Not Disturb
Windows 10 calls this feature Focus Assist. Windows 11 renamed it Do not disturb. Both suppress notifications when active.
- Windows 10: Settings > System > Focus Assist > Off.
- Windows 11: Settings > System > Notifications > Do not disturb > Off.
Note: Check that Windows Quiet Hours are not active, as they can mute notification sounds even when Focus Assist appears to be off.
3. Check Slack's In-App Preferences on Windows
- Click your profile picture > Preferences > Notifications.
- Confirm a desktop notification on Slack is checked.
- Scroll to Sound & appearance and confirm a sound is selected.
4. Clear Cache and Reinstall on Windows
- Go to Settings on your Windows computer
- Click Apps → Installed apps (or Apps & features)
- Find and select Slack from the list
- Choose Uninstall, then reinstall the app from the official source
- Click Advanced options, then scroll down and select Reset to clear cache data
How to Fix Slack Notifications in a Browser
If you use Slack in a browser (Chrome, Edge, Firefox, or Safari), the browser itself controls whether notifications are allowed. Slack can't send you a banner notification if the browser has blocked the permission.
For Edge
- Go to Settings
- Open Privacy, search, and services
- Click Site permissions → All permissions
- Select Notifications
- Add Slack website and click Allow
For Firefox
- Open Settings
- Go to Privacy & Security
- Scroll to Notifications
- Add the Slack website and click Allow
For Chrome
- Go to Settings
- Click Privacy & Security
- Open Notifications
- Add the Slack website and click Allow
For Safari
- Open Settings
- Go to Websites
- Click Notifications
- Add the Slack website and set to Allow
Note: Browser-based Slack can only send notifications for workspaces that are open in an active browser tab. If you've closed the tab, push notifications won't arrive in your browser.
Fix Stuck Badge Notifications or Slack Notifications Won't Go Away
If you see badge notifications for conversations you've already read, or your Threads view won't unbold, Slack may be out of sync with its server.
- On desktop: Press Shift + Esc to mark everything as read across all channels and workspaces to resolve Slack muted channels.
- On mobile: Go to your notification settings and use the Reset Cache / Clear Data option. Note that this will sign you out of all workspaces.
If neither step resolves stuck badges, contact Slack support and include your workspace URL and email address with a brief description of the problem.
Still Not Working? Advanced Fixes
If the issue persists after basic fixes, try these advanced steps to identify deeper problems affecting Slack notifications and app performance.
- Check Slack's status page: Visit status.Slack.com. If Slack is experiencing an outage, no local fix will help — wait for Slack to resolve the issue.
- Send Slack your logs: Help > Troubleshooting > Report Issue. Include a description of the problem. Your logs will be attached automatically.
- Check your network: VPN connections, corporate firewalls, or proxy settings can block the push notification service Slack uses. Try disabling your VPN temporarily to test.
- Switch between Mac App Store and direct download versions: If you installed Slack from the Mac App Store, try the direct download from Slack.com/downloads, or vice versa. Slack has acknowledged this as a workaround for some persistent macOS notification bugs.
- Update Slack and your OS: Make sure you're on the latest version of both Slack and your operating system.
You can also refer to Slack’s official notifications troubleshooting guide for more details.
How to Make Sure You Never Miss an Important Message Again
Even when Slack notifications are working, important messages can still get lost in busy Slack channels and fast-moving threads. Alerts depend on timing, and once missed, they’re hard to find again. A better approach is to turn key messages into trackable tasks. Using a Slack ticketing system which helps teams track important requests without relying only on notifications. Use Suptask to manage important tasks clearly and avoid missing messages in your Slack workflow.
Using a Slack ticketing system helps teams track important requests without relying only on notifications. Suptask keeps your Slack workflow organized and ensures nothing important gets missed.
FAQs
Why are my Slack notifications not working on my Mac?
Check System Settings > Notifications > Slack, make sure notifications are allowed, disable Focus mode, and clear Slack’s cache. Missing permissions, active Focus settings, or corrupted cache files are the most common causes on Mac.
Why is my Slack notification sound not working?
Enable Play sound for notifications in your operating system and select a sound in Slack’s Preferences > Notifications > Sound & appearance section. Also confirm your device volume and correct audio output devices are active.
How do I turn Slack notifications back on?
Click your profile picture, resume paused notifications if the snooze icon appears, then open Preferences > Notifications and enable desktop and mobile alerts. This restores normal Slack notifications across devices.
Why are my Slack notifications delayed?
Set Notify Me on Mobile to “As soon as I’m inactive” for faster delivery. On Android devices, disabling battery optimization for Slack also helps prevent delayed notifications.
How do I stop Slack from muting channels automatically?
Open the channel, click the channel name, and review the Notifications settings to make sure it is not muted. If needed, switch notifications to All new posts or Just mentions.
Does Slack stop sending notifications when I'm active on the desktop?
Change the setting in Preferences > Notifications if you want alerts on both desktop and mobile at the same time. By default, Slack delays mobile notifications while you are active on desktop.
Why are Slack notifications silent?
Check Slack’s Sound & appearance settings, confirm notification sounds are enabled in your operating system, and make sure your device is not muted. Focus mode or Do Not Disturb can also silence alerts.
