XAMARIN - Firebase Cloud Messaging - Android Device not display notification but he receives it

Hi I'm trying to send notifications to an Android device. I am using this plugin CrossGeeks/PushNotificationPlugin I created the firebase project and extracted the parameters for use on web api that I made with .NET Core MVC 3.1 When I send the notification, the breakpoint on the event is triggered correctly CrossPushNotification.Current.OnNotificationReceived + = (s, p) => However, no notification is displayed on my device. If, on the other hand, I use the firebase console to send a notification, it appears correctly with both the inactive app and the foreground app. For this reason, since my client application correctly receives notifications from firebase, I think the problem is server side. This is my code:

[HttpPost, Route("Prova")]
public async Task<IActionResult> SendNotication()
{
    try
    {
        var notification = new GoogleNotification();
        notification.Data = new GoogleNotification.DataPayload();
        notification.Data.Title = "Title";
        notification.Data.Body = "bla bla";        


        using (var fcm = new FcmSender("xxxxxx", "yyyyy"))
        {

            await fcm.SendAsync("hhhhhhh", notification);

        }



        return Ok("Done");
    }
    catch (Exception ex)
    {
        return BadRequest(ex.Message);
    }
}

 public class GoogleNotification
    {
        public class DataPayload
        {
            [JsonProperty("title")]
            public string Title { get; set; }
            // Add your custom properties as needed
            [JsonProperty("body")]
            public string Body { get; set; }

            [JsonProperty("tag")]
            public string Tag { get; set; }
        }

        //[JsonProperty("priority")]
        //public string Priority { get; set; } = "high";

        [JsonProperty("data")]
        public DataPayload Data { get; set; }
    }

I have doubts about the GoogleNotification class, do you think it is correct? I tried through the chrome console to understand the json that generates the firebase console. in fact it is very different to my code

{
  "basics": {},
  "productAction": {
    "notificationAction": {
      "campaignId": "1581564767326567420",
      "messageText": "ciao",
      "campaignStatus": "STATUS_ENQUEUED",
      "displayParameters": {
        "title": "Titolo",
        "priority": "HIGH"
      },
      "registrationIds": [
        "dcdsdsffds"
      ],
      "expiryTime": "2419200s",
      "lastUpdateTime": "2020-01-23T09:15:57.079Z"
    }
  }
}