iOS 11 provides support for OAuth 2.0 (Modern Auth) in the native mail app

With the release of iOS 11.0, the native mail client has now support for OAuth 2.0. OAuth 2.0 is often mentioned as modern authentication and provides some new capabilities like Microsoft Azure Multi-factor Authentication support and allows to using certificates for authentications. Modern Authentication uses a secure token instead of

login.windows.net still needs to be added to trusted sites in Internet Explorer

During some troubleshooting it was discovered that for some reason “https://login.windows.net” needs to added to “IE trusted site” else you wouldn’t get a PRT (Primary Refresh Token) issued in some scenarios. Microsoft have been working on merging theĀ Azure AD Authentication Flows since March 2015, but this still doesn’t seem to