Companion App running without Google Framework Services

Hi, we are a fitness equipment manufacturer that implement your companion app on our android based AOSP display.
Starting with version 3.34 we cannot use the application anymore, because the platform does not provide google framework services (it is not a personal device, it could be placed in a public gym with a lot of customers using it), and the app does not load the main page:

2022-04-27 11:13:33.907 11578-11578/ E/Event: Could not dispatch event: class to subscribing class class
java.lang.NullPointerException: Gson().fromJson(firebase… must not be null
at java.lang.reflect.Method.invoke(Native Method)
at de.greenrobot.event.EventBus.f(SourceFile:1)
at de.greenrobot.event.EventBus.e(SourceFile:5)
at de.greenrobot.event.HandlerPoster.handleMessage(SourceFile:9)
at android.os.Handler.dispatchMessage(
at android.os.Looper.loop(
at java.lang.reflect.Method.invoke(Native Method)

Here is an explanation on how the equipment integrates with the app:

support. technogym. com / post / zwift-on-technogym-ride

Feel free to contact me for further information about the platform.
If there is no solution for this, we will be forced to remove the app from all our device and references to the app as well.