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Microsoft Teams allows for various notifications settings controlled either by the Team's Teams application itself or through the MacOS.   Some folks prefer the red numbered notification badge that pops up on application icons in the MacOS dock verses the audible "dings", buzzes or banners that may be more intrusive to your daily work.  You can switch between Teams vs MacOS notification settings but to allow the dock icon option, you'll need to activate the MacOS notifications for Teams.   

  Red notification badge on the Team's Teams icon in the Dock. 

To activate MacOS notifications for Teams, open Teams and to the left of your user profile icon in the upper right there are three dots that indicate more settings.

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Next, in the Mac System Preferences,  open the Notification's Notifications pane.

In the Notifications pane, choose Teams on the left side and select your desired notification settings on the right.  Badge app icon is one of those options. 

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If Microsoft Teams does not show up on the left side of the Notification's Notifications pane, you'll need to double-check your notifications settings in Teams as described above.  

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