If you can't disable multi-factor authentication for the Office 365 global administrator account, which is required by the express configuration option, use the custom configuration option.
Before using the custom configuration, you must register the Azure app for Teams with Azure AD.
You can either perform the app registration manually or you can use the configuration helper tool to automate the app registration.
Before You Begin
Verify that you have a user account that is licensed for Teams.
Procedure
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Register the Azure app by using one of the below options:
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Complete the Office 365 guided setup using the custom configuration option.