Capacitor update FCM to iOS no longer working

I updated capacitor to the latest version (2.4.6) from 1.1.1 for @capacitor/ios only. I left the rest at 1.1.1. In order to resolve some swift compiler errors in the latest xCode.

I have released the app to the store and FCM to iOS devices does not seem to be working.
It says in the FCM dashboard that 22 have been sent to iOS (should be around 1000) and none of my iOS devices have received them. It still works fine for Android.

I am using the package capacitor-fcm v0.0.7.

I know this has now been replaced with @capacitor-community/fcm as I have used that in another project.

Do I have to downgrade Capacitor or upgrade to the new fcm package?