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Completes the asynchronous request initiated by BeginGetUser(Uri, AsyncCallback, Object).
Assembly: Microsoft.Rtc.Collaboration.GroupChat (in Microsoft.Rtc.Collaboration.GroupChat.dll)
Thrown when invalid arguments are passed.
Thrown when the chat server encountered an error processing the request.
Thrown when the GroupChatEndpoint encounters an error communicating with the group chat server.
Thrown when invoked multiple times with the same asyncResult.