This is the who, what, where, and shh! of notification settings in Microsoft Teams. Visit Manage notifications in Teams for more details about how to adjust your notification settings.
1. Notification settings are under your profile
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2. Notification sounds can be on or off
To choose if a sound plays with each new notification, select your profile picture at the top right corner of Teams, then Settings > Notifications > toggle off/on.
In this state, notification sounds are on.
3. There are default settings
If you change nothing about your Teams notifications, you'll receive both desktop notifications and activity feed alerts for @mentions, direct messages (chat), and all new conversations and @mentions in the channels and teams that show in your teams list.