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Consider the following scenario in a Microsoft Skype for Business Server 2015 environment:
In this scenario, the user move fails. Additionally, you see many SIP messages are queued on Front-End servers.
This issue occurs because of a failure in the RtcUpdateResourceAttributes stored procedure that's caused by time-out.
To fix this issue, install the December 2017 cumulative update 6.0.9319.510 for Skype for Business Server 2015, core components.
Keywords: kb, kbfix, kbsurveynew, kbexpertiseAdvanced, Can't move users between Lync pools