Consider the following scenario:
You install the Work Folders role on a server that is running Windows Server 2012 R2.
You configure Work Folders to use Active Directory Federation Services (AD FS) authentication.
The security token service (STS) server's clock is faster than the Work Folders server's clock.
In this scenario, files are not synchronized between client devices and the Work Folders server.
This issue occurs because the Work Folders server validates the issuance time of a token against its own clock. Therefore, the tokens that are issued by the STS server to client devices are not accepted by the Work Folders server.
To resolve this issue, install update rollup 2887595. 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:
2887595 Windows RT 8.1, Windows 8.1, and Windows Server 2012 R2 update rollup: November 2013
Microsoft has confirmed that this is a problem 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 updates