best response confirmed by Jihun Kim 김지훈 부장 (주)두산 정보 (New Contributor)
Solution

As with most other O365 services, Microsoft releases Teams updates in "rings" in order to get additional validation. Read here: https://docs.microsoft.com/en-us/office365/admin/manage/release-options-in-office-365?view=o365-worl...

 

You as an Microsoft employee are in a "lower" ring compared to the general public, and the "IT" designation signifies that.

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