FCM push notifications are sending but not delivering for iOS 13 - ios

Question

I'm using Firebase and have integrated FCM into my project. I have everything hooked up correctly notification wise because I can send and receive notifications on my device when I send notifications from the Firebase console Notification Composer. However when I try to send a notification from my device it sends but the device doesn't receive it. Here's my AppDelegate code:
class AppDelegate: UIResponder, UIApplicationDelegate, MessagingDelegate, UNUserNotificationCenterDelegate {
var window: UIWindow?
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
// Override point for customization after application launch.
FirebaseApp.configure()
Messaging.messaging().delegate = self
UNUserNotificationCenter.current().delegate = self
if #available(iOS 13.0, *) {
// For iOS 10 display notification (sent via APNS)
let authOptions: UNAuthorizationOptions = [.alert, .badge, .sound]
UNUserNotificationCenter.current().requestAuthorization(
options: authOptions,
completionHandler: {_, _ in })
} else {
let settings: UIUserNotificationSettings =
UIUserNotificationSettings(types: [.alert, .badge, .sound], categories: nil)
application.registerUserNotificationSettings(settings)
}
application.registerForRemoteNotifications()
return true
}
func messaging(_ messaging: Messaging, didReceiveRegistrationToken fcmToken: String) {
print("Firebase registration token: \(fcmToken)")
let dataDict:[String: String] = ["token": fcmToken]
NotificationCenter.default.post(name: Notification.Name("FCMToken"), object: nil, userInfo: dataDict)
// TODO: If necessary send token to application server.
// Note: This callback is fired at each app startup and whenever a new token is generated.
}
func application(application: UIApplication, didReceiveRemoteNotification userInfo: [NSObject : AnyObject], fetchCompletionHandler completionHandler: (UIBackgroundFetchResult) -> Void)
{
Messaging.messaging().appDidReceiveMessage(userInfo)
print("Token has been recieved.")
}
func userNotificationCenter(_ center: UNUserNotificationCenter, didReceive response: UNNotificationResponse, withCompletionHandler completionHandler: #escaping () -> Void) {
}
And here is my index.js code:
const functions = require('firebase-functions');
const admin = require('firebase-admin');
admin.initializeApp();
var db = admin.database();
var usersRef = db.ref('/Users')
// Values for sending notifications
var currentUsername = String()
var notificationMessage = String()
exports.sendInviteNotification =
functions.database.ref('/Users/{userID}/signals/inviteSignal/toUID').onCreate((snapshot, context) => {
let userID = snapshot.val()
var currentUserRef = usersRef.child(context.params.userID)
currentUserRef.on('value', function(snapshot) {
currentUsername = snapshot.child('username').val();
notificationMessage = snapshot.child('/signals/inviteSignal/message').val();
console.log('notification sent from:', currentUsername, 'notification sent to:', userID, 'message body:', notificationMessage)
})
var toUserRef = usersRef.child(userID)
toUserRef.on('value', function(snapshot) {
let fcmToken = snapshot.child('fcmToken').val();
console.log(fcmToken)
var payload = {
notification: {
title: "Invite from ${currentUsername}",
body: notificationMessage,
}
}
admin.messaging().sendToDevice(fcmToken, payload)
.then((response) => {
console.log('Successfully sent notification:', response)
})
.catch((error) => {
console.log('Error sending message:', error)
})
})
return true
})