Turn Off Microsoft Teams Notifications for Both Online and Desktop Apps

Go to Microsoft Teams main page. Then follow the steps below to adjust its notification settings. 

1. Click on the three dots. 
2. Then, click on Settings. 

3. On the Settings page, click on Notifications. 
4. Select the notification settings you wish to change  
5. You can also edit the notification settings for Chat, Meetings, People and Other by clicking the relevant Edit buttons. 

All changes will take effect immediately.