Server 500 Error

[dkrancer]

I am getting a server error when I try to get the request response (request.GetResponseAsync)

WebRequest request = WebRequest.Create("https://play.ht/api/v1/convert");
           request.Method = "POST";
               request.ContentType = "application/json";
               request.Headers.Set("Authorization", "authkey");
               request.Headers.Set("X-User-ID", "userid");

               using (var streamWriter = new StreamWriter(request.GetRequestStream()))
               {
                   string json = "{\"voice\":\"es-ES-Standard-A\"," +
                                 "\"content\":\"What is the weather today\"}";

                   streamWriter.Write(json);
               }

  WebResponse response = await request.GetResponseAsync();
               Console.WriteLine(((HttpWebResponse)response).StatusDescription);
              
                  using (var dataStream = new StreamReader(response.GetResponseStream()))
               {
                      string responseFromServer = dataStream.ReadToEnd();
                 
        Console.WriteLine("Server Response: " + responseFromServer);
               }

          
               response.Close();