How to set up Office 365 modern authentication

As Microsoft implements modern authentication across Office 365, administrators need to understand how to use and control the authentication framework to avoid disruptions.

Modern authentication is an updated set of authentication protocols and policies for Office 365 and Azure that allow improved authentication scenarios. Modern authentication is the term Microsoft uses for its version of OAuth 2.0 to utilize multifactor authentication, smart card authentication and other advanced authentication flows that were not possible with basic, or legacy, authentication.