Fix Teams Mentions Do Not Trigger an Alert on Teams for the Web

When you use Teams on the web, mentions of your name should produce a notification sound and a visual alert. But sometimes the alert never appears, and you miss important messages. This problem usually comes from browser notification settings, Teams notification preferences, or the way the web app handles permissions. This article explains the root cause and gives you step-by-step fixes to restore mention alerts in Teams for the web.

You will learn how to check your browser permissions, adjust Teams notification settings, and verify that the web app is not being blocked by your operating system. The fixes work in Chrome, Edge, and Firefox. If you still miss alerts after applying the steps, the article covers related failure patterns and a comparison of alert behavior between the desktop and web versions.

Why Teams Mentions Do Not Trigger Alerts in the Web App

Teams for the web is a browser-based client that depends on the browser’s notification API to show alerts. When you receive a mention, the web app sends a notification request to the browser. The browser then displays the alert and plays a sound if the site is allowed to send notifications.

The alert fails when any of these three layers blocks it: the browser permission for the Teams site is set to block, the Teams notification policy inside the app is set to mute or off, or the operating system suppresses notifications from the browser. A fourth cause is that you are using the web app in a private or incognito window, which often resets permissions.

Another common cause is that the browser is not focused or the tab is in the background. Some browsers throttle notifications for background tabs. The fix is to install Teams as a Progressive Web App, which runs as a separate window and receives notifications reliably.

How Browser Permissions Affect Mention Alerts

Every browser stores a permission setting for each site. If the Teams site has a block permission, the web app cannot show any notification. The permission is stored per browser profile, so a different profile may still show alerts.

How Teams Notification Settings Interact with the Browser

Teams has its own notification settings that control which events trigger alerts. The Mentions setting must be set to Banner and sound, not to Only show in feed or Off. Even if the browser allows notifications, the Teams setting can suppress them.

Steps to Diagnose and Fix Mention Alerts in Teams on the Web

Follow these steps in order. Test after each step by asking a colleague to send you a mention or by mentioning yourself in a channel.

1. Check the browser notification permission for the Teams site
   Open the Teams web app and click the lock icon next to the address bar. Look for the Notifications section and set it to Allow. If the option is grayed out, click Site settings and change the Notifications dropdown to Allow. Reload the page.
2. Verify the Teams notification policy for mentions
   In Teams, click your profile picture at the top right, then Settings. Select Notifications, find the Mentions section, and set the dropdown to Banner and sound. If it is set to Only show in feed, change it. This setting overrides the browser permission in some cases.
3. Check Windows notification settings for the browser
   Open Windows Settings and select System, then Notifications. Find your browser in the list and make sure notifications are enabled. If you use Chrome, also check that the Teams web app is not listed under the browser’s notification exceptions.
4. Disable Focus Assist or Do Not Disturb mode
   Press the Windows key plus A to open Action Center. Check if Focus Assist is on. If it is, click it to turn it off or set it to Priority only. This mode can block browser notifications silently.
5. Install Teams as a Progressive Web App
   In Teams for the web, click the install icon in the address bar or go to the browser menu and select Install Teams. This creates a separate window that receives notifications even when the browser is in the background. After installation, sign in again and test the mention.
6. Clear the browser cache and site data for the Teams domain
   Go to your browser’s settings, find the site data section, and remove data for the Teams domain. This resets corrupted permission states. Then reload the Teams web app and sign in again.

If You Use a Private or Incognito Window

Private windows start with default permissions, which often block notifications. To fix this, allow notifications for the Teams site while in the private window, or use a regular window. Teams does not remember permissions between private sessions.

If You Use Multiple Browser Profiles

Each browser profile has separate permissions. If you switch profiles, you must set the notification permission again. Check that the profile you usually use has the Allow permission.

If Teams Still Has Issues After the Main Fix

Mentions Work in the Desktop App but Not in the Web App

This points to a browser-specific problem. Try a different browser or update your current browser to the latest version. The desktop app uses the Windows notification service, while the web app relies on the browser.

Alerts Appear but No Sound Plays

Check your system volume and the browser tab’s mute state. Right-click the tab and select Unmute tab. Also verify that the Teams notification sound is not disabled in Windows Sound settings.

Mentions Appear in the Activity Feed but Not as Pop-ups

This happens when the Teams notification setting is set to Banner only, but the browser blocks the pop-up. Recheck the browser permission and the Teams setting. Set the mention option to Banner and sound.

Notifications Only Work When the Browser Is Focused

Some browsers limit notifications for background tabs to save battery. Install the Teams PWA to get a dedicated window that is not affected by this limit.

Teams Web vs Teams Desktop: Alert Behavior Compared

Item	Teams on the Web	Teams Desktop App
Notification source	Browser notification API	Windows notification service
Background tab alerts	May be throttled by the browser	Always delivered
Permission management	Per-site browser permission	Windows notification settings
Private window support	Permissions reset each session	Not applicable
Sound control	Browser tab and system volume	Teams settings and system volume

Now you can restore mention alerts in Teams for the web by checking the browser permission, the Teams notification setting, and the Windows notification options. Start by testing the browser permission, then move to the Teams settings. If the problem persists, install the Teams PWA to get reliable alerts in a separate window. The PWA also gives you a dedicated taskbar icon and better notification handling.