If you do not want to use the Commvault hosted multi-tenant apps configured via express configuration (which is recommended), you can use the custom configuration option.
Before using the custom configuration you must register the Azure app for SharePoint Online with Azure AD. You can either perform the app registration manually on the Azure portal or you can use the configuration helper tool to automate the app registration.
Additionally, you need to create an Azure certificate using Microsoft PowerShell commands and upload it in the Azure website.
Configure up to 5 single-tenant apps via custom config for better backup and restore performance.
Procedure
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Register the Azure app by using one of the below options:
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Create a Conditional Access Policy for SharePoint Online Azure Apps