OAuth authentication fails in Lync Server 2013 that has the January 2017 cumulative update installed - Microsoft Support

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Lync Server 2013 More...Less

Symptoms

OAuth authentication fails for Microsoft Unified Communications Web API (UCWA) after you install the January 2017 cumulative update 5.0.8308.984 for Lync Server 2013, Conferencing Server (KB 3210184).

Cause

This issue occurs because the Microsoft.Web.Infrastructure.dll file isn’t updated in the January 2017 cumulative update for Lync Server 2013.

Resolution

To fix this issue, install the March 2017 cumulative update 5.0.8308.987 for Lync Server 2013, Web Components Server.

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