Silent Push Notifications

Silent Push Notification is not received to the device.

I am sending push notifications from the https://fcm.googleapis.com/fcm/send

Request Payload:

{
    "content_available": true,
    "apns_priority": 10,
    "data": {
        "title": "Title of the notification",
        "body": "This string has message",
        "deviceId": "f565fa30-b5b2-11ec-bb6c-79ad60e4f707"
    },
    "registration_ids":[ "List of registered devices"]
}

Now when I send the notification. I am getting the notification randomly on the devices. I was sending notification to 5 devices. Now 3 devices were receiving the notification and 2 device didn't received.

• When the app is running in the foreground I am getting notification in all devices.
• When app is in background I am getting notifications.
• When app is killed by the user and even phone is locked I didn't receive any notification in couple of devices and received in other device.

Now, when I open the app I immediately received the notification.

I read an article from apple doc on silent push notification and there it is clearly mentioned that there is no guarantee of notification delivery to the device.

I cannot use normal notifications because I am filtering data before the notification. If payload have device id which is equal to stored device id then I fired a local notification if not then notification is silent.

Any solution for this issue?