c# - apns 推送通知和更新未到达

Question

我在 c# asp.net 上的项目，对于苹果钱包 pkpass，注册和注销任务工作完美，当我调试工作 amazin 但是，当我尝试发送消息时，调试一切正常，但通知没有到达客户端（移动) 任何人都可以在这个问题上帮助我们吗？注意：正如他们在苹果文档中提到的那样。从 2021 年 3 月开始，他们将使用 tls12 和 http/2。我没明白 http/2 的意思

private void SendEmptyPushNotification(payload objpayload, string pushToken)
{
    
    string server = "api.push.apple.com"; // Production getway.push.apple.com and 2195 is legacy now is 2197
    using (TcpClient tcpClient = new TcpClient(server, 443))
    {
        using (SslStream sslStream = new SslStream(tcpClient.GetStream()))
        {
            try
            {
                string path_to_apple_certificate =  VapidKeys.PassTypeCertificateP ;
                byte[] applecertificateData = File.ReadAllBytes(path_to_apple_certificate);
                X509Certificate2Collection certs = new X509Certificate2Collection();
                X509Certificate cert = GetCertificateFromBytes(applecertificateData, VapidKeys.PassTypeCertificatePassword); // here the pass
                certs.Add(cert);
                sslStream.AuthenticateAsClient(server, certs, SslProtocols.Tls12, false);
            }
            catch (AuthenticationException exp)
            {
                string messagee = exp.Message;
                throw new AuthenticationException(exp.Message);
                int x = 5;
                int y = 10;
                int l = x + y;
                Console.Write(exp.Message);
            }
            catch (IOException exp)
            {
                throw new IOException(exp.Message);
            }
            MemoryStream memoryStream = new MemoryStream();
            BinaryWriter writer = new BinaryWriter(memoryStream);
            writer.Write((byte)0);
            writer.Write((byte)0);
            writer.Write((byte)32);
            writer.Write(ConvertHexStringToByteArray(pushToken.ToUpper()));
            //string payload = "{\"aps\":\"\"}";
            string payload = "{\"aps\":{\"badge\":1,\"sound\":\"oven.caf\",\"alert\":\"" + "hello testing" + "\"}}";// @"{""aps"":{""alert"":{""Title"":"" title hello "", ""body"":"" bodey hello ""},},}";// string payload = "{\"aps\":{\"alert\":\"" + "Title " + objpayload.title + ": " + objpayload.message + "\"}}";
            writer.Write((byte)0);
            writer.Write((byte)payload.Length);
            byte[] b1 = System.Text.Encoding.UTF8.GetBytes(payload);
            writer.Write(b1);
            writer.Flush();
            byte[] array = memoryStream.ToArray();
            sslStream.Write(array);
            sslStream.Flush();
            tcpClient.Close();
        }
    }
}