Slack Notifications: How to Set Up, Fix, and Customize

This is an independent guide. Not affiliated with or endorsed by Slack Technologies, LLC or Salesforce, Inc.

You missed an important message from your manager because Slack didn't buzz, ping, or flash. Or the opposite happened: your phone won't stop vibrating with notifications from channels you don't care about. Either way, Slack notifications aren't doing what you need them to do.

Slack gives you a lot of control over how and when you get notified. The problem is that the settings are spread across your profile preferences, individual channels, your operating system, and your phone. One wrong toggle and everything breaks silently.

This guide covers how Slack notifications work, how to configure them properly, how to fix them when they stop working, and how to change notification sounds. If you're new to Slack, start with our how to use Slack guide first.

Slack Notifications Not Working: Troubleshooting

When Slack notifications stop working, the cause is almost always one of these six things. Work through them in order.

1. Check Do Not Disturb and notification schedule. Open Slack and look at your profile icon. If there's a "z" or moon icon, DND is active and all notifications are paused. Click your profile picture and check "Pause notifications." Also check Preferences > Notifications > Notification schedule to make sure your active hours are set correctly. A common mistake: your schedule is set to a different time zone than where you actually are.

2. Check channel muting. If you're missing notifications from a specific channel, you may have muted it. Right-click the channel name and look for "Unmute channel." Muted channels show a crossed-out bell icon next to their name in the sidebar. Also check whether the channel's notification override is set to "Nothing."

3. Check OS notification permissions. Slack needs permission from your operating system to show alerts. On Mac, go to System Settings > Notifications > Slack and make sure "Allow Notifications" is turned on. On Windows, go to Settings > System > Notifications and confirm Slack is enabled. On iPhone, go to Settings > Notifications > Slack. On Android, go to Settings > Apps > Slack > Notifications.

4. Check your Slack app version. Outdated versions of Slack can have notification bugs. Open Slack, click Help > Check for Updates (desktop), or update through the App Store / Google Play (mobile). Slack pushes frequent updates, and notification fixes are a common part of release notes.

5. Clear Slack's cache. On desktop, go to Help > Troubleshooting > Clear Cache and Restart. Corrupted cache data can interfere with notification delivery. This won't delete your messages or settings.

6. Check Focus mode and system notification settings. On Mac, Focus mode can silently block Slack notifications even when Slack's own settings are correct. Open System Settings > Focus and check whether a Focus profile is active that filters out Slack. On iPhone, the same Focus settings apply. Make sure Slack is listed as an allowed app in whatever Focus mode you're using.

Rachel, a product manager, spent a week thinking her team had stopped mentioning her in standups. She'd check the channel hours later and find three @mentions she never saw. The culprit: she'd enabled a "Work" Focus mode on her Mac that allowed Messages and Calendar but blocked everything else, including Slack. Adding Slack to the Focus allowlist fixed it in 10 seconds.

Slack Notification Sounds: How to Change Them

Slack's default notification sound is distinct, but after hearing it hundreds of times a day, you might want something different.

On desktop: Go to Preferences > Notifications. Under "Sound & appearance," you'll find a dropdown to change the notification sound. Slack includes several built-in options. You can also turn sounds off entirely and rely on visual badges and banners instead.

On mobile: Open the Slack app, tap your profile picture, go to Notifications, and look for sound settings. On iOS, Slack uses its own sound options within the app. On Android, you can assign a custom sound through your device's system notification settings for the Slack app.

Turning off sounds selectively: If you want sounds for DMs but not for channel messages, you'll need to use channel-specific notification overrides. Mute the noisy channels or set them to "Nothing," and keep your global notification sound on for everything else.

One thing to keep in mind: if you use Slack on both desktop and mobile, Slack tries to avoid double-notifying you. It waits a few seconds before sending a mobile push if it detects you're active on desktop. If you close your laptop, mobile notifications should kick in within a couple of minutes. If they don't, check the troubleshooting steps above.

Notification Best Practices for Teams

Notification overload is a team problem, not just an individual one. A few ground rules go a long way.

Don't use @channel or @here for non-urgent messages. These mentions notify every active person in the channel. Reserve them for genuinely time-sensitive announcements. Use @channel for outages and deadlines, not for lunch polls. Some teams restrict @channel permissions to admins in large channels.

Use threads for follow-up discussions. When someone replies in a thread instead of the main channel, only people following that thread get notified. This keeps the channel feed clean and prevents 30 people from getting pinged about a conversation between two.

Set expectations around response times. Not every Slack message needs an immediate reply. Make it clear in your team's norms that asynchronous responses are fine for most messages, and specify which channels or keywords signal urgency. If you need a fast answer, say so explicitly.

Mute channels you don't need in real time. You can always check a muted channel when you have time. Muting #social or #watercooler doesn't mean you're anti-fun; it means you're protecting your focus during work hours.

Tom's engineering team had a #deployments channel that fired a bot notification every time a build finished. Twelve engineers got pinged 40 times a day. The fix was simple: everyone muted the channel and checked it on their own schedule. Critical deploy failures went to #incidents with @channel, which averaged two alerts per week. Notification fatigue dropped overnight.

Slack is a trademark of Slack Technologies, LLC, a Salesforce company. This site is not affiliated with, endorsed by, or sponsored by Slack Technologies, LLC or Salesforce, Inc.

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