If you don't want to use the Microsoft login information, which is required by the express configuration option, you can use the custom configuration option.
Before using the custom configuration, you must register the Azure app for SharePoint Online with Azure AD.
Procedure
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Register the Azure app for SharePoint 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.