Notifications on Amazon FireOS (no GCM/FCM)

I know this is not a bug of the app and this is mostly amazons fault.
FireOS by amazon does not have FCM implemented, so i am not able to receive any notifications from openhab.
Is there a workaround to get FCM working on a not-rooted Amazon Fire HD 10 (2019) with FireOS 7.3.1.1?
What looks like a bug though is that the App says that the registration for FCM was successful but the log says it failed.
I will post the log later today.

That’s definitely a bug. Can you open a GitHub issue?

One could implement the FCM replacement by Amazon in the app and the openhab cloud or implement a fallback method if no FCM is present. I’m not aware of any workaround.