iOS Token Generated NULL on Production

Hi Everyone,

I have successfully deployed the app on App Store, the App also contains functionality for Push Notification,using [this pacakge](https://www.npmjs.com/package/cordova-plugin-push-notification)

Its working on Local, but getting NULL as token when downloaded the app from Apple store.

Also, I searched this, some people said Adding FirebaseAppDelegateProxyEnabled Key to your Info.plist does the trick. But this also not working for Me.

Please help. As this is the last step for the app to go live. Any help would be greatly appreciated. Thanks!!