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Beginning January 14, 2020, the Teams client will be added to existing O365 installations
Beginning January 14, 2020, the Teams client will be added to existing installations for customers on the Semi-Annual Channel. We limit the use of teams app \ desktop client to selected ...
This is covered in the documentation: https://docs.microsoft.com/en-us/deployoffice/teams-install#what-about-existing-installations-of-office-365-proplus