The Configure Office 365 Authentication dialog box is used to enable Microsoft Office 365 authentication for an SDx Web Client site.
ClientId - Specifies the unique ID that is generated when the application is registered in Microsoft Azure active directory.
Authority - Specifies the tenant ID that is available in the Azure active directory for the organization. This tenant ID is a part of authority which needs to be updated. For example, https://login.microsoftonline.com/<tenant id>/.
RedirectURl - the url of the current selected Web Client site.