If you see any of the below errors in your Lync 2010 Front End servers event log, changes are you may have used capitalisation in the "SIP:" notation pre-pended to the SIP address.
e.g. SIP: first.last@lync.com
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The Lync control panel will tell you when you forget to add "sip:" but fails to inform you the "SIP:" will cause issue.
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EventID: 31012
A valid URI was not specified for the queue time out destination.
EventID: 31161
The Match Making service could not transfer the call because of an error in the queue configuration.
EventID: 31117
The workflow runtime encountered a critical error.
e.g. SIP: first.last@lync.com
The Lync control panel will tell you when you forget to add "sip:" but fails to inform you the "SIP:" will cause issue.
EventID: 31012
A valid URI was not specified for the queue time out destination.
EventID: 31161
The Match Making service could not transfer the call because of an error in the queue configuration.
EventID: 31117
The workflow runtime encountered a critical error.