The "OK" Button is dimmed when you select a response group in Forward Calls in Lync 2013 (Skype for business)

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Microsoft Lync 2013 Skype for Business More...Less

Symptoms

This issue occurs when you open the Forward Calls dialog box by selecting Tools > Options > Call Forwarding > Unanswered calls will go to in order to select a response group in Microsoft Lync 2013 (Microsoft Skype for business).

When this issue occurs, the response group can't be selected.

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.