Firebase push notification c#

Question

var applicationID = "dno8ujDPEuWJXrRzudDK";
var senderId = "636408391381";
string deviceId = "*************";
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 = obj_Parameter.Message,
title = obj_Parameter.TagMsg,
icon = "myicon"
},
priority = "high"
};
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();
obj.Response = 1;
obj.ErrorMessage = sResponseFromServer;
}
}
}
}
}
catch (Exception ex)
{
obj.Response = 0;
obj.ErrorMessage = "Internal Server Error";
}
return obj;

I have test this code but i have face this error -

 

{\"multicast_id\":9049684377314331171,\"success\":0,\"failure\":1,\"canonical_ids\":0,\"results\":[{\"error\":\"InvalidRegistration\"}]}"

it's me parameter

{

"Message": "New Content!",

"TagMsg": "A new video has been uploaded."

}

 

Please solve this