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Contacts push error - ErrorCode=2002,Reason=Group does not exist Microsoft.Rtc.Signaling.DiagnosticHeader

Aug 14 at 4:33 PM
Hello,

I increasingly am seeing this error when doing contacts pushes and am not able to work out what it means or how to resolve it. The Lync group definitely exists. We used to just restart the server where the LUMT pushes run but this doesn't seem to work anymore. Has anyone seen this error and able to advise? Certain contacts pushes we do from the same server run perfectly and certain ones are much more error prone.

2017-08-14 16:05:17 ERROR Error while processing user sip:user@domain.com: A 400 (Bad request) response was received from the network and the operation failed. See the exception details for more information.. Inner Exception: A 400 (Bad request) response was received from the network and the operation failed. See the exception details for more information.. Diag Info: ErrorCode=2002,Source=frontend@domain.com,Reason=Group does not exist
Microsoft.Rtc.Signaling.DiagnosticHeader

Any help would be appreciated!

Regards,
Mike