Hi,

Did have any luck with this issue? I´m having the same problem.

I am in the same boat. Any progress on this ?

I was able to manually inject authorization like so

public class ClientMessageInspector : IClientMessageInspector
{
public void AfterReceiveReply(ref Message reply, object correlationState)
{
// Nothing Here
Console.Write(reply.ToString());
}

public object BeforeSendRequest(ref Message request, IClientChannel channel)
{
HttpRequestMessageProperty httpRequestProperty = new HttpRequestMessageProperty();
httpRequestProperty.Headers[HttpRequestHeader.Authorization] = "Basic " +
Convert.ToBase64String(Encoding.ASCII.GetBytes("username" + ":" +
"password));
request.Properties.Add(HttpRequestMessageProperty.Name, httpRequestProperty);
return null;
}
}

public class CustomEndpoint : IEndpointBehavior
{
public void AddBindingParameters(ServiceEndpoint endpoint, BindingParameterCollection bindingParameters)
{
// Nothing here
}

public void ApplyClientBehavior(ServiceEndpoint endpoint, ClientRuntime clientRuntime)
{
clientRuntime.ClientMessageInspectors.Add(new ClientMessageInspector());
}

public void ApplyDispatchBehavior(ServiceEndpoint endpoint, EndpointDispatcher endpointDispatcher)
{
// Nothing here
}

public void Validate(ServiceEndpoint endpoint)
{
// Nothing here
}
}

And adding the custom endpoint to the proxy 

var proxy = new CAdxWebServiceXmlCCClient();
proxy.Endpoint.EndpointBehaviors.Add(new CustomEndpoint());

However, I had issue with the client deserialization that was throwing an error.