Firebase sign in not working after I sign out - swift

Question

So the first sign in into the Swift UI app works fine. I sign in and the view changes to the home view from the sign in view. However, after I log out, the sign in doesn't cause my view to change, so I assume it doesn't work.
Here is my AuthViewModel where I handle the sign in and sign out.
import FirebaseAuth
class AuthViewModel: ObservableObject {
static let shared = AuthViewModel()
private(set) var authSubscription: AuthStateDidChangeListenerHandle?
#Published var currentUser: User?
#Published var error: Error?
init() {
authSubscription = Auth.auth().addStateDidChangeListener { [weak self] (auth, user) in
self?.currentUser = user
}
}
func signIn(email: String, password: String) {
Auth.auth().signIn(withEmail: email, password: password) { [weak self] (authResult, error) in
if let error = error {
self?.error = error
} else {
self?.error = nil
}
}
}
func signUp(email: String, password: String) {
Auth.auth().createUser(withEmail: email, password: password) { [weak self] (authResult, error) in
if let error = error {
self?.error = error
} else {
self?.error = nil
}
}
}
func signOut() {
do {
try Auth.auth().signOut()
} catch let error {
self.error = error
}
}
}
Also here is how I am switching from my sign up view to the home view
struct ContentView: View {
#State var screenOn = 0
#EnvironmentObject var authViewModel: AuthViewModel
var body: some View {
if let user = authViewModel.currentUser {
if screenOn == 0 {
someView(screenOn: $screenOn)
.onAppear(perform: UIApplication.shared.addTapGestureRecognizer)
.onOpenURL { url in
let link = url.absoluteString
}
} else if screenOn == 1 {
someView(screenOn: $screenOn)
.onAppear {
authViewModel.signOut()
}
} else if screenOn == 3 {
someView(screenOn: $screenOn)
} else if screenOn == 4 {
someView(screenOn: $screenOn)
}
} else {
Loginpage()
}
}
}