Delete the Teams Application in Microsoft 365
Adding and deleting the Teams Application several times especially in short duration from the ConnecttoTeams portal can lead to cache errors in Microsoft Office.
One of the most effective tools to correct the situation is to completely delete the Application from Microsoft Office.
How to Delete the Teams Application
Follow these steps to remove the App from the Teams Admin Center.
Go to Teams Admin Center >>Teams Apps>>Manage Apps and search for the App you created in the ConnecttoTeams portal which should also appear in the Teams User.
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View of the App in the Teams Admin menu on the left and as seen from within Teams on the right.
Click Actions >>Delete
In the Azure Active Directory Admin Center, Click Azure Active Directory then click "Groups" under Manage. Find the group that was used for the old app deployment and delete it permanently.
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Wait for at least 30 minutes to give Microsoft time to propagate the change.
Using the ConnecttoTeams Enterprise portal, reprovision the Teams Application.
In some cases there are conditions that require a manual sync to fully clear the Application from the Microsoft Enterprise.