push-notifications-firebase-swift | Push Notifications with Firebase in Swift | Notification library

I am using FCM to create and send push notifications for my iOS app.

Dev Environment:

• Xcode 11.3

• iPhone X running iOS 13.3

• Swift 5.2

Pod Versions:

• Firebase 6.14.0
• FirebaseMessaging 4.1.10
• FirebaseInstanceID 4.2.8

Problem:

Prior to running into an issue, I had setup my app to be able to receive notifications when the app was in both the background and the foreground. Very happy with myself I committed the code. After this point I have been unable to receive notifications in the foreground OR the background. Regardless of using whether the notification is sent from Cloud Messaging dashboard or POSTMAN, I receive a successful response but the notification never appears.

At first I thought I may have hit the notification quota but it is now 2 days post fact.

To troubleshoot I have tried:

1. Uninstalled and re-installed the app (Which refreshes the device token)
2. Moved UIApplication.shared.registerForRemoteNotifications() to before FirebaseApp.configure()
3. Downloaded a fresh GoogleService-Info.plist and replaced existing
4. Checked that bundle id's etc all match
5. Updated firebase pods to latest (FirebaseMessaging was at 4.1.9 if that helps)
6. Set Messaging.messaging().shouldEstablishDirectChannel = true
7. Removed and Re-added the needed capabilities
8. Set FirebaseAppDelegateProxyEnabled to both YES and NO
9. Set shouldEstablishDirectChannel = true
10. Set useMessagingDelegateForDirectChannel = true
11. Moved some logic from didFinishLaunchingWithOptions() to applicationDidBecomeActive()

Code:

Note: This is the unaltered code that originally worked for me.

AppDelegate.swift