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Push notification is not working when app is in background (minimized) - IOS

I'm newbie to Swift, i am creating chat application, i need to send notification when app is in foreground or minimized.

but i am not getting the notification when app is minimized (it works when USB is connected.

func application(_ application: UIApplication, didReceiveRemoteNotification userInfo: [AnyHashable: Any],fetchCompletionHandler completionHandler: @escaping (UIBackgroundFetchResult) -> Void)
{
Messaging.messaging().appDidReceiveMessage(userInfo)

let action = userInfo["action"] as! String
let notification = UILocalNotification()
notification.fireDate = NSDate() as Date
notification.alertTitle = "test"
notification.alertBody = "test"
notification.alertAction = "Ok"
UIApplication.shared.applicationIconBadgeNumber = 1
UIApplication.shared.scheduleLocalNotification(notification)
completionHandler(UIBackgroundFetchResult.newData)
}


Notification code:

@available(iOS 10, *)
extension AppDelegate : UNUserNotificationCenterDelegate {

// Receive displayed notifications for iOS 10 devices.
func userNotificationCenter(_ center: UNUserNotificationCenter,
willPresent notification: UNNotification,
withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void) {
let userInfo = notification.request.content.userInfo
center.removeAllDeliveredNotifications() // to remove all delivered notifications
center.removeAllPendingNotificationRequests() // to remove all pending notifications
// With swizzling disabled you must let Messaging know about the message, for Analytics
// Messaging.messaging().appDidReceiveMessage(userInfo)
// Print message ID.
if let messageID = userInfo[gcmMessageIDKey] {
print("Message ID: (messageID)")
}

// Print full message.
print(userInfo)

// Change this to your preferred presentation option
completionHandler([.alert, .sound, .badge])
}

func userNotificationCenter(_ center: UNUserNotificationCenter,
didReceive response: UNNotificationResponse,
withCompletionHandler completionHandler: @escaping () -> Void) {
let userInfo = response.notification.request.content.userInfo
// Print message ID.
if let messageID = userInfo[gcmMessageIDKey] {
print("Message ID: (messageID)")
}

print(userInfo)

completionHandler()
}
}


FCM Payload:

{
"to" : "/topics/channel_18",
"data" : {
"action" : "NOTIFY",
"message" : "{"text":"test" }"
},
"content_available" : true
}


I have tried with Priority high and with Sound option but none works.

Please note that i am not using "notification" key as per client request.

Please anyone help me to work notification when app is in background without USB connection.

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