react-native-fcm | react native module for firebase cloud messaging | Authentication library

I'm trying to open an app at a specific screen, from a push notification. My understanding is that I use a "deep link" to do this. I've set up react-navigation to handle the deep link (and AndroidManifest.xml & appDelegate.m), and can open the deep link with xcrun simctl openurl booted myapp://a/1 / adb shell am start -W -a android.intent.action.VIEW -d "myapp://a/1" app.bundle.name.

But I can't get the push notification to open the app, at the deep link, when the app is closed; it only opens the app on the home screen (on both iOS and Android). How do I get the app to open at the deep link (or alternatively, to read the contents of the push notification so that I can navigate to the correct screen myself)?

library versions:

• react-native 0.62.2
• @react-navigation 5.5.1
• react-native-fcm 16.2.4

Been doing a lot of research on this issue, first my setup:

• React-native: 0.61.5
• react-native-firebase: 5.6.0
• Firebase Messaging 6.15.0

My issue quite simple and straight forward though I do not seem to be able to find a clear way to resolve the issue.

I deployed version 4.2 of my app. Firebase Cloud Messaging (FCM) in iOS works just dandy. I then deployed 4.3 to TestFlight to begin testing. Installed 4.3 via TestFlight and FCM stopped working, no push notifications. If I delete the app and install 4.3 via TestFlight push notifications work again, the device is registered.

I can also reproduce this issue updating the installed version of my app from the App Store published latest, no surprise there.

I know that the InstanceId/device token is based on the app build+device so it makes sense that the token changes when the app Updates but my token is the same when I update from 4.2 to 4.3: