On August 13, the Single Sign-On (SSO) protocol that is used in Microsoft Azure Active Directory (Azure AD) was updated, which unfortunately caused the SSO implementation in Microsoft Dynamics NAV 2013 R2 to fail temporarily. As a result, users could not log into Microsoft Dynamics NAV using their Office 365 credentials.
The problem was resolved later in the day so that single sign-on was again working for Microsoft Dynamics NAV users using Office 365 credentials. However, we have decided to change the way we handle authentication against Microsoft Azure AD so that we are less sensitive to this type of update to the SSO protocol. The new design will be part of the Cumulative Update 11 for Microsoft Dynamics NAV 2013 R2.
----- This blog post was updated on August 14 -------