Whenever someone reacts to a message, invites you to a meeting or event, or @ mentions you in Microsoft Teams Free, you will receive a notification. You can check your notifications in your Activity feed.

Select the Activity Activity tab button tab on mobile or Activity in your accounts and other orgs​​​​​​​ Teams (free) activity in your accounts and orgs person with bell on desktop to view your notifications. Select any item in the activity feed to jump to that message in chat or community. 

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For more help, contact support or ask a question in the Microsoft Teams Community.