Crashlytics not sending events on iOS

I've migrated our app from react-native-firebase to @react-native-firebase/crashlytics and managed to get crash reports from Android, but no luck with iOS.

I've done all the following:

• removed react-native-fabric and all of it's references
• installed @react-native-firebase/app
• installed @react-native-firebase/crashlytics
• added GoogleServices-info.plist in xCode as described in the manual
• added firebase.json in the root of the app with crashlytics_debug_enabled: true (this solved Android)

But still no success, not from the simulator nor from appCenter deployed app.

I think it's good to mention that we have 3 schemes (dev, staging, production).

Any idea how to make this work?