Symptoms
Signing in Microsoft Skype for Business 2015 (Lync 2013) sometimes fails or loops in a corrupted state after you unlock the computer in the sign-in progress.Additionally, you receive one of the following error messages when the issue occurs:
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INVALID_SIP_ADDRESS
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E_UNEXPECTED
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INVALID_OBJECT_STATE
Resolution
To fix this issue, install the December 6, 2016, update (KB3127976) for Skype for Business 2015 (Lync 2013).Note Lync 2013 was upgraded to Skype for Business in April 2015.
