为什么我无法将 WNS Toast 通知从 C# 发送到 Windows Phone 8.1

我遵循了以下两个指南：https://msdn.microsoft.com/en-us/library/windows/apps/hh202945（v=vs.105）.aspxhttps://msdn.microsoft.com/library/windows/apps/xaml/hh868252

生成的代码如下所示。尽管一切看起来都是正确的，但它返回了一个 404 错误。这怎么可能？任何帮助都会延缓我的自杀。

public static void PushToWindows2()
    {
        try
        {
            var accessToken = GetAccessToken("Nhz******************XkwX", "ms-app://s-1-15-2-***************-2150981501");
            byte[] contentInBytes = Encoding.UTF8.GetBytes("<toast launch='"'"><visual lang='"en-US'"><binding template='"ToastImageAndText01'"><image id='"1'" src='"World'" /><text id='"1'">Hello</text></binding></visual></toast>");
            HttpWebRequest request = HttpWebRequest.Create("https://db5.notify.windows.com/?token=awyaaaborhlhub%2bfxeytzjnz****************pftroh5l18sgorvgrkq%3d") as HttpWebRequest;
            request.Method = "POST";
            request.ContentLength = contentInBytes.Length;
            request.ContentType= "text/xml";
            request.Headers.Add("X-WindowsPhone-Target", "token");
            request.Headers.Add("X-NotificationClass", "1"); ;
            request.Headers.Add("X-WNS-Type", "wns/toast");
            request.Headers.Add("Authorization", String.Format("Bearer {0}", accessToken.AccessToken.ToString()));

            using (Stream requestStream = request.GetRequestStream())
                requestStream.Write(contentInBytes, 0, contentInBytes.Length);
            HttpWebResponse response = (HttpWebResponse)request.GetResponse();
            string notificationStatus = response.Headers["X-NotificationStatus"];
            string notificationChannelStatus = response.Headers["X-SubscriptionStatus"];
            string deviceConnectionStatus = response.Headers["X-DeviceConnectionStatus"];
        }
        catch (Exception ex)
        {
            Console.Write("EXCEPTION: " + ex.Message);
        }
    }
    [DataContract]
    public class OAuthToken
    {
        [DataMember(Name = "access_token")]
        public string AccessToken { get; set; }
        [DataMember(Name = "token_type")]
        public string TokenType { get; set; }
    }
    public static OAuthToken GetOAuthTokenFromJson(string jsonString)
    {
        using (var ms = new MemoryStream(Encoding.Unicode.GetBytes(jsonString)))
        {
            var ser = new DataContractJsonSerializer(typeof(OAuthToken));
            var oAuthToken = (OAuthToken)ser.ReadObject(ms);
            return oAuthToken;
        }
    }
    public static OAuthToken GetAccessToken(string secret, string sid)
    {
        var urlEncodedSecret = HttpUtility.UrlEncode(secret);
        var urlEncodedSid = HttpUtility.UrlEncode(sid);
        var body = String.Format("grant_type=client_credentials&client_id={0}&client_secret={1}&scope=notify.windows.com",
                                 urlEncodedSid,
                                 urlEncodedSecret);
        string response;
        using (var client = new WebClient())
        {
            client.Headers.Add("Content-Type", "application/x-www-form-urlencoded");
            response = client.UploadString("https://login.live.com/accesstoken.srf", body);
        }
        return GetOAuthTokenFromJson(response);
    }

我也尝试走PushSharp路线，在这种情况下，我收到"设备订阅已过期"错误。这里是：

 var config = new WnsConfiguration("424****.*******nts", "ms-app://s-1-15-2-***************1501", "Nhz************XkwX");
        // Create a new broker
        var wnsBroker = new WnsServiceBroker (config);
        wnsBroker.QueueNotification(new WnsToastNotification {
                ChannelUri = deviceId,
                Payload = XElement.Parse (@"
                    <toast>
                        <visual>
                            <binding template=""ToastText01"">
                                <text id=""1"">WNS_Send_Single</text>
                            </binding>  
                        </visual>
                    </toast>")
        });
    }

更新：

它与编码无关。我使用了带有 = 和 + 符号的未编码令牌以及编码标记。还是 404