didReceiveRemoteNotification:fetchCompletionHandler not being called when app(iOS 11.0.2) is in background and not connected to Xcode 9.0

Question

When app is in background and connected to Xcode, everything works fine but when i unplug any iOS device and run the app, move to background and send remote notification, didReceiveRemoteNotification:fetchCompletionHandler not being called.

Here is the code snippet:

func application(_ application: UIApplication,
                 didFailToRegisterForRemoteNotificationsWithError error: Error) {
    print("Failed to register: \(error)")
}

// MARK: - Notification Delegate
func application(_ application: UIApplication,
                 didReceiveRemoteNotification userInfo: [AnyHashable : Any],
                 fetchCompletionHandler completionHandler: @escaping (UIBackgroundFetchResult) -> Void) {

    if UserDefaults.standard.value(forKey: Constants.Key.authToken) != nil {

        print("Payload is: \(userInfo)")

        var dataDict : [String:Any] = [:]
        if (userInfo["data"] != nil){
            dataDict = userInfo["data"] as! [String : Any]
        }

        // ID : notification type
        var idType = 0
        if (dataDict["id"] != nil){
            idType = dataDict["id"] as! Int
        }

        let state = UIApplication.shared.applicationState
        print("state is \(state)")

        // Application in forground state...
        if state == .active {
            self.postNotificationOfType(idType, dict: dataDict)
        }

        // Application in background state...
        else if state == .background || state == .inactive {
            self.postNotificationOfType(idType, dict: dataDict)
        }


    }
    else{
        print("User is logged out!")
    }

    completionHandler(.newData)

}

func postNotificationOfType(_ idType:Int, dict:[String:Any]){

    // service request received
    if idType == 1{

        if (dict["serviceRequestId"] != nil){
            NotificationCenter.default.post(name: Notification.Name("ServiceRequestReceived"), object: nil, userInfo: dict)
        }
    }

    // service request canceled by client
    else if idType == 2 {
        NotificationCenter.default.post(name: Notification.Name("ServiceRequestCanceled"), object: nil)
    }

    // service started by client
    else if idType == 5 {
        NotificationCenter.default.post(name: Notification.Name("ServiceStartedByClient"), object: nil)
    }

        // service started by client
    else if idType == 6 {
        NotificationCenter.default.post(name: Notification.Name("ServiceEndedByClient"), object: nil)
    }
}

Here is my payload:

 {
"aps" : {
    "content-available" : 1
},
"data" : 1

}

Any help will be appreciated. Thanks in advance.