android – Flutter / Firebase push notifications not fired when app is closed

I’m utilizing firebase messaging to ship notifications to customers in flutter utility, and every little thing is working high-quality when I’m sending notification from postman (notification at all times exhibits), however then after I wish to ship the identical notification from my backend server, notification not displaying on machine. On server logs I can see that notification was ship with success like this:

{
    "multicast_id": XXXXXXXXXXXXX,
    "success": 1,
    "failure": 0,
    "canonical_ids": 0,
    "outcomes": [
        {
            "message_id": "XXXXXXXXXXXXX"
        }
    ]
}

So it means it was accurately ship to messaging providers, however push notification not firing on machine.

Generally after I open app (going to foreground of utility) then notification in some way exhibits, however I want customers to see notification at all times, particularly when their app is closed.

I’m sending notification with excessive precedence so this isn’t a difficulty.

Any assist, what might be potential difficulty with this?

My request to FCM:

POST: https://fcm.googleapis.com/fcm/ship
Authorization: key=xxxx_MY_KEY_XXXXX
Content material-Kind: utility/json

{
    "to": "xxxxxMY_FCM_TOKEN_xxxxxx",
    "mutable_content": true,
    "content_available": true,
    "precedence": "excessive",
    "information": {
        "content material": {
            "id": 106,
            "channelKey": "remote_chann",
            "title": "Whats up",
            "physique": "check",
            "notificationLayout": "Messaging"
        }
    }
}