用C#寫了一段後台利用FCM推播的code
回傳的訊息

{"message_id":7638543291219000886}

只有收到這個回應，但是我的手機並沒有收到推播

 try
            {
                //伺服器
                string applicationID = "AIzaSyBhYzPkQgYND6P5cpLvEMoTUbJpgJeks";
                string senderId = "968899743755";
                string deviceId = "/topics/ios";
               
                WebRequest tRequest = WebRequest.Create("https://fcm.googleapis.com/fcm/send");
                tRequest.Method = "post";
                tRequest.ContentType = "application/json";
                var data = new
                {
                    to = deviceId,
                    notification = new
                    {
                        body = "test",
                        title = "test",
                        sound = "default"
                    }
                };
                var serializer = new JavaScriptSerializer();
                var json = serializer.Serialize(data);
                Byte[] byteArray = Encoding.UTF8.GetBytes(json);
                tRequest.Headers.Add(string.Format("Authorization: key={0}", applicationID));
                tRequest.Headers.Add(string.Format("Sender: id={0}", senderId));
                tRequest.ContentLength = byteArray.Length;
                using (Stream dataStream = tRequest.GetRequestStream())
                {
                    dataStream.Write(byteArray, 0, byteArray.Length);
                    using (WebResponse tResponse = tRequest.GetResponse())
                    {
                        using (Stream dataStreamResponse = tResponse.GetResponseStream())
                        {
                            using (StreamReader tReader = new StreamReader(dataStreamResponse))
                            {
                                String sResponseFromServer = tReader.ReadToEnd();
                                string str = sResponseFromServer;
                            }
                        }
                    }
                }
            }
            catch (Exception ex)
            {
                string str = ex.Message;
            }

用FCM平台手動推播可以成功

使用以上的CODE有回傳成功的訊息，但手機沒收到

麻煩有經驗的大哥幫我解答了