从邮递员发送FCM推送通知但保留api

Question

我正在从Firebase发送推送通知，但是如果我在设备接收邮递员通知时使用相同的参数，但在其余api上使用相同的参数，则表示成功但未收到通知。

    if (SendTo.Length > 0)
                {
                    FCMBody body = new FCMBody();
                    FCMNotification notification = new FCMNotification();
                    notification.title = Title;
                    notification.body = Body;
                    FCMData data = new FCMData();
                    data.key1 = ((int)ToPage).ToString();
                    data.key2 = ToParam;
                    data.key3 = ToParam2;
                    data.key4 = ToParam3;

                    body.registration_ids = SendTo;
                    body.notification = notification;
                    body.data = data;
                    return SendNotification(body).Result;
                }
                return false;

        static async Task<bool> SendNotification(FCMBody fcmBody)
        {
                var httpContent = JsonConvert.SerializeObject(fcmBody);
                var client = new HttpClient();
                var authorization = string.Format("key={0}", "My firebase key");
                client.DefaultRequestHeaders.TryAddWithoutValidation("Authorization", authorization);
                var stringContent = new StringContent(httpContent);
                stringContent.Headers.ContentType = new System.Net.Http.Headers.MediaTypeHeaderValue("application/json");
                string uri = "https://fcm.googleapis.com/fcm/send";
                var response = await client.PostAsync(uri, stringContent).ConfigureAwait(false);
                var result = response.Content.ReadAsStringAsync();
                if (response.IsSuccessStatusCode)
                    return true;
                else                  
  return false;
    }

我复制了api的主体部分，并且所有参数都是相同的，并由邮递员发送并由设备接收。