Remote Message is always null Firebase Cloud Messaging

Question

Please tell me what I'm doing wrong. I send a Cloud Message to my device, and when the application is closed, I want to check how it was launched from Push Notification or not. Also, if the application was opened from Push Notifications, I need to get the data in order to open the corresponding application page.

I found a method that checks whether the application was started by clicking on Push Notification FirebaseMessaging.instance.getInitialMessage(). But the answer to this call is always null, I closed the application completely, sent a notification, launched it and always the value = null. I also use a package to track and display messages: awesome_notification

This is what my code looks like:

FirebaseMessaging.instance.getInitialMessage().then((RemoteMessage? message) async {
      if(message != null){
        Get.snackbar('Title', '$message');
        auth.testMessage.value = message;
      }
      });

Request to send a message:

{
    "to" : "my_token",
    "mutable_content" : true,
    "content_available" : true,
   "priority" : "high",
   "data" : {
        "content": {
            "id": 100,
            "channelKey": "basic_channel",
            "title": "Huston!\nThe eagle has landed!",
            "body": "A small step for a man, but a giant leap to Flutter's community!",
            "notificationLayout": "BigPicture",
            "largeIcon": "https://media.fstatic.com/kdNpUx4VBicwDuRBnhBrNmVsaKU=/full-fit-in/290x478/media/artists/avatar/2013/08/neil-i-armstrong_a39978.jpeg",
            "bigPicture": "https://www.dw.com/image/49519617_303.jpg",
            "showWhen": true,
            "autoDismissible": true,
            "privacy": "Private"
        },
        "actionButtons": [
            {
                "key": "REPLY",
                "label": "Reply",
                "autoDismissible": true,
                "buttonType":  "InputField"
            },
            {
                "key": "ARCHIVE",
                "label": "Archive",
                "autoDismissible": true
            }
        ]
    }
}