@Published property in @EnvironmentObject doesn't update the root view of my application

Hello.

I am trying to make a router object for my application using @EnvironmentObject. But the problem is the @Published property doesn't update the root view when the root view type is updated.

How it should work

1. A user clicks Sign in with Apple button
2. Update the router.currentPage property of @EnvironmentObject when a user logs in successfully.
3. RootView get notified for updating router.currentPage and change the root view in accordance to the updated currentPage type.


Here are my codes below.

MainApp.swift

Code Block 
var body: some Scene {
  WindowGroup {				 
	RootView().environmentObject(ViewRouter())
  }
}

ViewRouter.swift

Code Block 
enum Page {
 case signin
 case tasklist
}
final class ViewRouter: ObservableObject { 
	@Published var currentPage: Page = .signin
 }

RootView.swift

Code Block 
struct RootView: View {
 @EnvironmentObject var router: ViewRouter
 var body: some View {
  if router.currentPage == .signin {
   SigninView()
  } else {
   TaskListView()
  }
 }
}

SigninView.swift

Code Block 
struct SigninView: View {
 @EnvironmentObject var router: ViewRouter
 @State var signInHandler: SignInWithAppleCoordinator?
  
 var window: UIWindow? {
  guard let scene = UIApplication.shared.connectedScenes.first,
     let windowSceneDelegate = scene.delegate as? UIWindowSceneDelegate,
     let window = windowSceneDelegate.window else {
   return nil
  }
  return window
 }
  
 var body: some View {
  MyAppleIDButton().colorScheme(.light)
   .frame(width: 280, height: 38, alignment: .center)
   .onTapGesture {
    signInWithAppleButtonTapped()
   }
 }
  
 func signInWithAppleButtonTapped() {
  guard let _window = self.window else { return }
  signInHandler = SignInWithAppleCoordinator(window: _window)
  signInHandler?.signIn { (user) in
   router.currentPage = .tasklist
  }
 }
}