Symptoms
Assume that you're in an audio conferencing provider (ACP) enabled meeting in Microsoft Lync 2013 (Microsoft Skype for business). When someone shares his desktop during the meeting, you're prompted to manually accept the shared content.
Resolution
To fix this issue, install the June 7, 2016, update (KB3115033) for Lync 2013 (Skype for Business).
Note Lync 2013 was upgraded to Skype for Business in April 2015.