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 Exchange Online with Azure AD.
Procedure
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Register the Azure app for Exchange Online with Azure AD.
Important
You can perform the registration manually, as described in step 1, or you can use the custom configuration toolkit. The toolkit, which automates the registration process, is available in step 2.
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Complete the Office 365 guided setup using the custom configuration option.