You have an invalid enpoint url ?
You should use the endpoint url displayed in your azure account.

Something like this:
https://westus.api.cognitive.microsoft.com/emotion/v1.0/recognize

Have used endpoint code too..

Can you post your endpoint?

Have used Key 2 as end point..

Have gone with Endpoint URL but its showing error message like this..

System.Net.Http.HttpRequestException: An error occurred while sending the request. ---> System.Net.WebException: Unable to connect to the remote server ---> System.Net.Sockets.SocketException: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond 40.112.254.71:443
at System.Net.Sockets.Socket.EndConnect(IAsyncResult asyncResult)
at System.Net.ServicePoint.ConnectSocketInternal(Boolean connectFailure, Socket s4, Socket s6, Socket& socket, IPAddress& address, ConnectSocketState state, IAsyncResult asyncResult, Exception& exception)
--- End of inner exception stack trace ---
at System.Net.HttpWebRequest.EndGetRequestStream(IAsyncResult asyncResult, TransportContext& context)
at System.Net.Http.HttpClientHandler.GetRequestStreamCallback(IAsyncResult ar)
--- End of inner exception stack trace ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Microsoft.ProjectOxford.Common.ServiceClient.<SendAsync>d__22`2.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Microsoft.ProjectOxford.Common.ServiceClient.<PostAsync>d__20`2.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Microsoft.ProjectOxford.Emotion.EmotionServiceClient.<RecognizeAsync>d__6.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Microsoft.ProjectOxford.Emotion.EmotionServiceClient.<RecognizeAsync>d__5.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()
at Microsoft_Cognitive_Vision.FormMain.<Camera_OnNewFrame>d__14.MoveNext() in C:\My Documents\SVN\Developer - Windows\ARC skill plugins\Microsoft Cognitive Emotion\Microsoft Cognitive Vision\FormMain.cs:line 166

Key2 is not the endpoint.

Look to the picture, you have Endpoint, Key1, Key2:





Questions:
1) Please post your endpoint url:

2) Can you reach internet from your desktop/ARC ?

Sorry to insist. I believe you are using the wrong endpoint url, go to your microsoft api account and use the endpoint url listed there.

Attention:
1) API keys are assigned per (Region) endpoint's url.
2) Some services are not available outside the selected geo location.

Thank You .. will check again with Endpoint URL..

I updated the plugin so the endpoint must be formatted correctly to ensure people don't paste something else instead.

Thank you DJ ! its working perfectly !

Thank you all for your support!