Stop Missing Slack Alerts: 8 Fixes That Work

Missing important Slack messages because notifications aren\’t working? You\’re not alone. This is one of the most common Slack issues, and it can seriously impact your team communication. In this guide, I\’ll walk you through 8 proven fixes for both desktop and mobile devices.

**TL;DR:** Check Do Not Disturb mode first, then verify notification settings in both Slack AND your device. Most notification issues are caused by conflicting settings between the app and your operating system.

Why Slack Notifications Stop Working

Before jumping into fixes, let\’s understand the common causes:

• **Do Not Disturb mode** enabled (in Slack or on your device)
• – **Notification preferences** set incorrectly
• – **App permissions** not granted
• – **Outdated Slack app** version
• – **Battery optimization** blocking background notifications
• – **Focus/Sleep mode** on your device
• – **Channel-specific settings** muting notifications

Fix 1: Check Do Not Disturb Mode in Slack

This is the #1 cause of missing notifications. Slack\’s DND mode silences all notifications.

**How to check:**

1. Open Slack
2. 2. Click your profile picture in the top-right
3. 3. Look for \”Pause notifications\” status
4. 4. If DND is on, click it and select \”Turn off\”

**Pro tip:** You might have accidentally enabled DND by clicking your status. The bell icon with a \”Z\” indicates DND is active.

Fix 2: Verify Slack Notification Preferences

Slack has detailed notification settings that might be blocking your alerts.

**Desktop (Windows/Mac):**

1. Click your workspace name in the top-left
2. 2. Select \”Preferences\” (or press Ctrl/Cmd + ,)
3. 3. Go to \”Notifications\” tab
4. 4. Ensure \”Notify me about\” is set correctly:
   • – **All new messages** – get everything
     • – **Direct messages, mentions & keywords** – recommended
       • – **Nothing** – no notifications at all
     • **Mobile (iOS/Android):**
   • 1. Tap the \”You\” tab at the bottom
   • 2. Tap \”Notifications\”
   • 3. Check \”On mobile, notify me about\” settings
   • 4. Make sure notifications aren\’t set to \”Nothing\”
5. ## Fix 3: Check Device System Notifications

Even if Slack settings are correct, your device might be blocking notifications.

**Windows 11/10:**

1. Go to Settings > System > Notifications
2. 2. Find Slack in the app list
3. 3. Make sure notifications are \”On\”
4. 4. Check that \”Focus assist\” isn\’t blocking alerts

**Mac:**

1. Go to System Settings > Notifications
2. 2. Find Slack in the app list
3. 3. Enable \”Allow Notifications\”
4. 4. Set alert style to \”Banners\” or \”Alerts\”

**iPhone:**

1. Go to Settings > Notifications > Slack
2. 2. Enable \”Allow Notifications\”
3. 3. Turn on Sounds, Badges, and Banners

**Android:**

1. Go to Settings > Apps > Slack > Notifications
2. 2. Enable all notification categories
3. 3. Set importance to \”High\” or \”Urgent\”

Fix 4: Disable Battery Optimization (Mobile)

Battery optimization features can prevent Slack from sending notifications in the background.

**Android:**

1. Go to Settings > Apps > Slack
2. 2. Tap \”Battery\”
3. 3. Select \”Unrestricted\” or \”Don\’t optimize\”
4. 4. This allows Slack to run in the background

**iPhone:**

1. Go to Settings > General > Background App Refresh
2. 2. Make sure it\’s enabled for Slack
3. 3. Also check Settings > Battery and ensure Low Power Mode is off

Fix 5: Check Channel-Specific Notification Settings

You might have muted specific channels without realizing it.

**How to check:**

1. Open the channel that\’s not sending notifications
2. 2. Click the channel name at the top
3. 3. Look for \”Notifications\” or \”Mute channel\” option
4. 4. Make sure it\’s not set to \”Mute\” or \”Nothing\”

**Bulk check:**

1. Go to Preferences > Notifications
2. 2. Scroll down to \”Channel-specific notifications\”
3. 3. Review any channels with custom settings
4. 4. Remove unwanted mutes

Fix 6: Update or Reinstall Slack

An outdated or corrupted Slack installation can cause notification issues.

**Update Slack:**

• **Desktop:** Click Help > Check for Updates (or download from slack.com)
• – **iOS:** Go to App Store > Updates > Update Slack
• – **Android:** Go to Play Store > My Apps > Update Slack

**Reinstall if updating doesn\’t work:**

1. Uninstall Slack completely
2. 2. Restart your device
3. 3. Download and install the latest version
4. 4. Sign in and reconfigure notification settings

Fix 7: Check Notification Schedule

Slack has a notification schedule feature that might be silencing alerts outside work hours.

**How to check:**

1. Go to Preferences > Notifications
2. 2. Find \”Notification schedule\” section
3. 3. Check the \”Allow notifications\” time range
4. 4. Either expand the hours or disable the schedule entirely

**Common issue:** If you work across time zones or have irregular hours, the default 8 AM – 6 PM schedule might be blocking important messages.

Fix 8: Sign Out and Sign Back In

Sometimes a simple sign-out/sign-in can reset notification connections.

**Steps:**

1. Click your profile picture
2. 2. Select \”Sign out of [workspace]\”
3. 3. Close Slack completely
4. 4. Reopen and sign back in
5. 5. Re-enable notifications if prompted

This refreshes your connection to Slack\’s notification servers and often resolves persistent issues.

Quick Troubleshooting Checklist

Use this checklist to quickly diagnose notification issues:

| Check | Desktop | Mobile |

|——-|———|——–|

| DND mode off in Slack | ✓ | ✓ |

| Slack notification preferences | ✓ | ✓ |

| System notifications enabled | ✓ | ✓ |

| Battery optimization disabled | – | ✓ |

| Channel not muted | ✓ | ✓ |

| App updated | ✓ | ✓ |

| Notification schedule | ✓ | ✓ |

| Signed in fresh | ✓ | ✓ |

Still Not Working? Contact Slack Support

If none of these fixes work, there might be a server-side issue or a bug specific to your setup.

**How to contact Slack:**

1. Go to slack.com/help
2. 2. Click \”Contact Us\”
3. 3. Describe your issue with details about:
   • – Device type and OS version
     • – Slack app version
       • – Steps you\’ve already tried
     • **Alternative:** Check status.slack.com to see if there\’s a known notification outage.
   • ## Conclusion
4. Slack notification issues are frustrating, but they\’re usually fixable. Start with Fix #1 (Do Not Disturb) since it\’s the most common culprit. Then work through the device-level settings, which account for most remaining issues.

**Quick recap:**

1. Check DND mode in Slack
2. 2. Verify Slack notification preferences
3. 3. Enable system notifications
4. 4. Disable battery optimization (mobile)
5. 5. Unmute specific channels
6. 6. Update or reinstall Slack
7. 7. Check notification schedule
8. 8. Sign out and back in

Have a different Slack issue? Check out our other SaaS troubleshooting guides!

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*Did this fix your Slack notifications? Share this guide with your teammates who might be having the same issue!*