Slack Notifications Not Working on Mac (2026): Complete Fix Guide for macOS Tahoe

You’re missing Slack messages because the alerts never show up, or they pop up without sound, or they only work in some workspaces. This guide fixes all three.

Last updated April 2026. Tested on macOS Tahoe with the current Slack desktop app.

Quick Checklist (Start Here)

If you only have 30 seconds, check these first:

1. Focus / Do Not Disturb is off (Control Center → click the Focus icon to disable)
2. Slack has notification permission (System Settings → Notifications → Slack → Allow)
3. In-app: Slack → Preferences → Notifications → “All new messages” selected
4. Alert style is set to Alerts or Banners (not None)
5. Slack is up to date — older builds have reported Tahoe issues (Slack menu → Help → Check for Updates)

If that didn’t fix it, work through the sections below.

How to Enable Slack Notifications on Mac

Two places need permission: macOS and Slack itself. Both must be on.

1. Allow notifications in macOS Tahoe

Apple reorganized notification settings in Tahoe. The new path:

1. Open System Settings
2. Click Notifications in the sidebar
3. Scroll to Application Notifications and find Slack
4. Toggle Allow notifications on
5. Set Alert style to Banners or Alerts (not None)
6. Enable Sounds, Badges, and Show in Notification Center
7. Optional: enable Show previews to see message content

2. Configure notifications inside Slack

Slack has its own notification layer that runs on top of macOS:

1. Open Slack
2. Click your profile picture → Preferences (or press ⌘,)
3. Select Notifications
4. Under Notify me about, pick All new messages for testing, then narrow down
5. Scroll to Sound & appearance and turn on notification sound
6. Uncheck Use Do Not Disturb Hours if you’re testing during those hours

Save and send yourself a DM from another device to verify.

Common Fixes in Priority Order

Most missing-notification issues fall into one of these buckets. Work top to bottom.

Focus mode is silencing Slack

macOS Tahoe uses Focus filters that can silence specific apps even when Focus looks off. Check both:

Is Focus on right now?

• Open Control Center (click the date/time area in the menu bar)
• If any Focus is active, click it to turn off
• The moon icon in the menu bar means Do Not Disturb is on

Is Slack allowed during Focus?

• System Settings → Focus → pick your active Focus (Work, Personal, etc.)
• Under Allowed Apps, add Slack
• Or switch Filter Apps from “Silence these apps” to “Allow these apps”

Tahoe handles Focus filters differently from older macOS versions. Users upgrading from Sonoma have reported running into this.

Slack in-app notification settings are too restrictive

Open Slack → Preferences → Notifications.

If Notify me about is set to Direct messages, mentions & keywords, you won’t get channel messages even from channels you joined. Switch to All new messages temporarily to confirm this is the issue.

Each channel also has its own override. Open a channel, click the channel name at the top, and check Notifications. Channel-level settings beat global ones.

macOS notification permission is off or partial

Even with notifications “allowed,” three sub-settings can block them:

• Alert style: None: alerts fire but don’t visibly appear
• Show previews: Never: you get a banner but it’s blank
• Play sound for notifications: off: notifications are silent

Check all three in System Settings → Notifications → Slack.

Slack is outdated or stuck

Older Slack builds have known Tahoe bugs. Update:

• Slack menu bar → Help → Check for Updates
• Or download fresh from slack.com/downloads/mac

If updating doesn’t help, force-quit Slack (⌥⌘Esc → select Slack → Force Quit) and reopen. This clears stuck notification daemons.

Multiple Slack workspaces have conflicting settings

Each workspace you’re signed into has its own notification preferences. Check each one:

1. Click the workspace icon on the left sidebar
2. Go to Preferences → Notifications
3. Confirm the same settings apply

If you use Slack Connect channels (cross-org), the host workspace controls the notification level.

Corrupted Slack cache

Rare but real. Reset:

1. Quit Slack completely
2. Open Terminal and run: rm -rf ~/Library/Application\ Support/Slack/Cache
3. Reopen Slack
4. Sign back in

This doesn’t delete your account or messages, just cached data.

Last resort: reinstall Slack

1. Quit Slack
2. Move /Applications/Slack.app to Trash
3. Delete ~/Library/Application Support/Slack
4. Delete ~/Library/Caches/com.tinyspeck.slackmacgap
5. Empty Trash, download fresh from slack.com
6. Install and sign in again

Slack Notification Sound Not Working

Missing sound is a different problem from missing alerts. The banner shows, but you hear nothing.

Fix 1: Enable sound in Slack

Slack → Preferences → Notifications → Sound & appearance:

• Notification sound dropdown: pick anything except None
• Huddle sound & appearance: separate setting for calls
• Make sure Play sound for notifications is checked

Fix 2: Enable sound in macOS

System Settings → Notifications → Slack → Play sound for notifications: on.

If it was already on, toggle it off and back on. This resets a common sound permission bug on Tahoe.

Fix 3: Check system sound output

Your notifications play through your system output device. If that’s a Bluetooth headset that disconnected, you won’t hear anything.

• Control Center → Sound → pick the right output
• Click the speaker slider to confirm volume isn’t at 0
• System Settings → Sound → Alert volume slider (separate from output volume)

Fix 4: Browser vs desktop app

If you’re using Slack in a browser tab, sounds require browser permission too. Chrome: click the lock icon in the address bar → Site settings → Sound: Allow. Safari: Safari → Settings → Websites → Auto-Play.

For reliable notifications, use the desktop app.

Fix 5: Custom sound file is missing

If you set a custom notification sound (Slack → Preferences → Notifications → custom sound), and then moved or deleted the file, Slack falls back to silent. Pick a built-in sound to rule this out.

macOS Tahoe-Specific Issues

Tahoe introduced changes that broke notifications for some users upgrading from Sonoma or Sequoia.

Notification Center moved

Tahoe redesigned Notification Center with the new Liquid Glass language. Swipe left with two fingers from the trackpad right edge, or click the date/time in the menu bar.

Focus Filters can carry over strict defaults

Some users report that custom Focus modes created on older macOS arrive in Tahoe with stricter app-silencing defaults. Audit each Focus mode in System Settings → Focus and confirm Slack is in Allowed Apps.

Screen Time quietly blocks notifications

If Screen Time has Slack in App Limits, notifications stop once you hit the limit. System Settings → Screen Time → App Limits → remove Slack or raise the limit.

Notification permission reset after major updates

Major macOS updates sometimes reset per-app notification preferences. If notifications stopped after a Tahoe update, re-enable them in System Settings → Notifications → Slack.

Browser Slack vs Desktop App

Browser Slack (slack.com in Chrome, Safari, Firefox) uses a different notification system than the desktop app:

• The browser must be open for notifications to fire
• The browser must have notification permission for slack.com
• macOS must have notification permission for the browser itself (Chrome, Safari)
• Sounds require separate browser-level permission

If you want Slack notifications to work when the browser is closed, you need the desktop app.

Add Slack to Your Menu Bar with Badgeify

Once notifications work, the next problem is noticing them. A banner shows for 5 seconds and disappears. If you were away, you miss it.

Badgeify adds a Slack icon with a live unread badge directly to your menu bar. You see the unread count at a glance, without opening Slack or digging through Notification Center.

Setup:

1. Download Badgeify from badgeify.app/download
2. Launch and grant permissions
3. Click + → select Slack → confirm
4. Badgeify mirrors Slack’s unread count in your menu bar

Badgeify doesn’t replace system notifications. It adds a persistent visual signal so you catch unread messages even after the banner disappears. See the full Slack setup guide for screenshots.

FAQ

Why am I not getting Slack notifications on my Mac? The most common cause is Focus mode silencing Slack. Second most common: the macOS Notifications permission for Slack is off. Third: Slack’s in-app notification preferences are set to “Nothing” or “Direct messages, mentions & keywords” only. Work through the sections above in order.

Why is my Slack notification sound not working on Mac? Four things to check: (1) Slack → Preferences → Notifications has a sound selected, (2) System Settings → Notifications → Slack has “Play sound for notifications” on, (3) your system output isn’t a disconnected Bluetooth device, (4) Alert volume in System Settings → Sound isn’t at 0. Missing sound is almost always a separate issue from missing alerts.

How do I enable Slack desktop notifications on Mac? Two places: in Slack itself (Preferences → Notifications → pick “All new messages” or a specific filter), and in macOS (System Settings → Notifications → Slack → toggle Allow Notifications on). Both layers need permission.

I’m not getting Slack notifications on Mac even though the settings look right. What now? Force-quit Slack (⌥⌘Esc) and reopen. If that fails, restart your Mac to clear stuck notification daemons. If still broken, run Console.app, filter by “slack,” send yourself a test DM, and look for errors. Most persistent cases are cache corruption. See the cache reset steps above.

Does macOS Tahoe break Slack notifications? Only for users who upgraded from older macOS with custom Focus filters. Tahoe migrates Focus settings with stricter defaults. Audit each Focus mode and add Slack to Allowed Apps. Also verify notification permission didn’t reset during the upgrade.

Can I have different notification settings for each Slack workspace? Yes. Each workspace stores its own notification preferences. Switch workspaces using the sidebar icons, then open Preferences → Notifications for each one. Channel-level settings inside a workspace override workspace-level settings.

Do Slack notifications work in the browser? Yes, but with extra requirements. The browser tab must be open, the browser must have macOS notification permission, and slack.com must have browser-level permission. For reliable notifications without keeping a tab open, use the desktop app.

How do I test if my Slack notifications are working? Open Slack on your phone, send a DM to yourself. If your Mac doesn’t notify within 3 seconds, something is blocking. Check Focus first, then permissions.

If Nothing Above Worked

Collect this info before contacting Slack support:

• macOS version (System Settings → General → About)
• Slack version (Slack menu → About Slack)
• Whether the issue is across all workspaces or one
• Whether sound works but alerts don’t, or vice versa
• Any relevant Console.app errors when notifications should fire

Slack support responds faster when you provide this upfront.

For a cleaner menu bar setup alongside reliable notifications, compare the current Bartender alternatives for Mac to keep icons organized, then add Badgeify for live unread badges.