Firebase 404 NOT_FOUND

I am trying to implement firebase admin into ASP.NET core but I am missing something… Everytime I run my code I get the following error:

Response status code does not indicate success: 404 (NotFound)
{
  "error": {
    "code": 404,
    "message": "Requested entity was not found.",
    "errors": [
      {
        "message": "Requested entity was not found.",
        "domain": "global",
        "reason": "notFound"
      }
    ],
    "status": "NOT_FOUND"
  }
}

The code that I am running:

var message = new Message
{
    Token = fcmToken,
    Data = new Dictionary<string, string>
    {
        {"title", notification.Title},
        {"body", notification.Message},
        {"channel", notification.Channel},
        {"level", ((int)notification.Level).ToString()},
        {"link", notification.Link}
    }
};

try
{
    var fcmResult = await FirebaseMessaging.DefaultInstance.SendAsync(message);
}
catch (Exception ex)
{

}

Registration:

if (FirebaseApp.DefaultInstance == null)
{
    FirebaseApp.Create(new AppOptions
    {
        Credential = GoogleCredential.FromJson(Settings.Default.Firebase_Server_Auth)
    });
}

Github link: https://github.com/kevingoos/FirebaseAdminTest Stackoverflow: https://stackoverflow.com/questions/56499904/firebaseadmin-messaging-returning-404-not-found

[hiranya911]

This happens when the token is invalid/expired or does not belong to the same project as the credentials used to initialize the Admin SDK.

[hiranya911]

It’s most likely a matter of expired or invalid FCM registration token. Make sure the token is up-to-date (this needs to be handled at the client side), and the token belongs to the same project as the service account.