You can assign a user or user group to the Teams app.
Procedure
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From the Command Center navigation pane, go to Protect > Microsoft 365.
The Microsoft 365 apps page appears.
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On the Apps tab, click the app.
The Overview page of the app appears.
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On the Configuration tab, in the Security tile, click Edit.
The Security dialog box appears.
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In the Enter users, user groups box, enter the user or user group name, and then under Roles, select a role.
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Click Add.
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Click Save.