Firebasemessagingexception: the registration token is not a valid FCM registration token

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Android

Xamarin

Android4x

Good Day All

i have a Xamarin App , i want to implement Push Notification. i use FirebaseAdmin to send this notifications to a specific user.

When the app loads for the first time i trap the token and store it in the database and in my app.cs i also subscribed to the notification refresh event so i trap the changes of the device token as it changes.

CrossFirebasePushNotification.Current.OnTokenRefresh += Current_OnTokenRefresh;

and in this event i go and update the token on the db.

i created a webapi that can be called by the app to send push notification , i hardcoded the token by copying it from the db table and my app is on release mode on the emulator

on the web api i called it via Fiddler which a different project and debugged it to check if there is any other issues , everything gets executed correctly with no issues except the last line

string response = FirebaseMessaging.DefaultInstance.SendAsync(message).Result;

and it gaves me an error

"FirebaseMessagingException: The registration token is not a valid FCM registration token"

and the example code that tries to sent the Push notification is as below

try
            {
                PUSH_MESSAGE model = new PUSH_MESSAGE();
                model.SENDER_HANDLE = "vuyiswamb";
                model.RECEIVER_TOKEN = "e-itrrcdtoodv7rkx6g2yy:apa91bfu1hczrzpaubya9umv3d3guzt_dcz8zhfgbxaltse4fbamcv2kklf6ekdmxhg_g9inwamja8-6vfzfrlqkpm8mi956ncfcsa-jrsmp50qsbblehgiz9ezo7ih3h1aavrodl_jn";
                model.SENDER_USER_ID = 1;
                model.TITLE = "Hello Girl";
                model.MESSAGE_BODY = "How this is working";
                model.SENDER_USER_TOKEN = new Guid("84819756-A839-45A0-ACB3-08BCAADAD3BB");

                if (model.SENDER_USER_TOKEN != new Guid("00000000-0000-0000-0000-000000000000"))
                {
                    FirebaseApp.Create(new AppOptions()
                    {
                        Credential = GoogleCredential.FromFile(System.Web.Hosting.HostingEnvironment.MapPath(@"~/private_key.json"))
                    });

                    var registrationToken = model.RECEIVER_TOKEN;
                     
                    var message = new Message()
                    {
                        Data = new Dictionary<string, string>()
                    {
                        { "SENDER_USER", model.SENDER_USER_ID.ToString() },
                    }, 
                        Token =registrationToken,
                        //Topic = "TrovaPush",
                        Notification = new Notification()
                        {
                            Title = model.TITLE,
                            Body = model.MESSAGE_BODY,
                            ImageUrl = model.ICON_URL
                        }
                    };

                    // Send a message to the device corresponding to the provided 
                    string response = FirebaseMessaging.DefaultInstance.SendAsync(message).Result;
 
                }

            }
            catch (Exception ex)
            {
                throw ex;
            }

The Token is the latest i have in the database

Thanks

What I have tried:

i tried to check if there is another token that is refreshed that i am not trapping in the app.cs but i realized that i have catered for properly