Couldn't find the correct provider

I am doing an experiment, where I want to make two similar apps with single source code.

I am trying to make an "adaptive" State on top of the widget tree, and this state (ChangeNotifier) depends on the application (isApp1() determines which app is this ).

here's the code that I'm using:

ChangeNotifierProvider(
      create: (context) {
        return isApp1() ? AppState1() : AppState2();
      },
      child: MaterialApp(
        onGenerateRoute: isAdminApp()
            ? App1Router.generateRoute
            : App2Router.generateRoute,
        initialRoute: "/",
      ),
    );

when I try to read the state using Provider.of in the low levels of the tree I am facing the error:

Error: Could not find the correct Provider<AppState1> above this Widget

Note: when I put AppState1() or AppState2() directly instead of isApp1() ? AppState1() : AppState2() I don't face this error.