This article describes an update that enables you to sign in Active Directory Federation Services (AD FS) in Windows Server 2012 R2 by using an alternative logon ID instead of by using a user principal name (UPN).
To enable this feature, install update 2919355. For more information about how to obtain this update rollup package, click the following article number to view the article in the Microsoft Knowledge Base:
2919355 Windows RT 8.1, Windows 8.1, and Windows Server 2012 R2 Update April, 2014
Microsoft has confirmed that this is an update in the Microsoft products that are listed in the "Applies to" section.
For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:
824684 Description of the standard terminology that is used to describe Microsoft software updatesFor more information about AD FS in Windows Server 2012 R2, go to the following Microsoft website: