Opening Testflight App from Another App and Deep Link to Specific App

How to handle opening a URL to load a specific app screen?

Here's my solution to this issue:

struct myApp: App {
    @ObservedObject var authenticator = Authenticator.shared
    @State var route: URL?
    @State var urlToken: String?
    
    var body: some Scene {
        WindowGroup {
            RootView(url: route)
                .onOpenURL { url in
                    self.route = url
                    if url.pathComponents.contains("reset"), let token = url.queryDictionary?["token"] {
                        self.urlToken = token
                    }
                }
                .fullScreenCover(item: $urlToken) { _ in
                    NavigationView {
                        PasswordResetView(viewModel: .init(onFinish: {
                            route = nil
                            urlToken = nil
                        }))
                        .onAppear {
                            self.authenticator.accessToken = urlToken
                        }
                    }
                }
        }
    }
}

struct RootView: View {
    @ObservedObject var authenticator = Authenticator.shared

    var body: some View {
        if authenticator.accessToken != nil {
            MainTabView()
        } else {
            NavigationView {
               FirstView()
            }
        }
    }
}

What is deep link and how i can create it for App Store?

This is known as 'deferred deep linking'. It's complicated to build — I don't recommend trying to do it yourself. Take a look at free services like Branch.io (full disclosure: I'm on the Branch team) or Firebase Dynamic Links.

Firebase dynamic link not working with Testflight IOS

Hey I had the same problem. Have a look at your associated domains (Xcode build settings) for all configurations and make sure they match Firebase.
Mine had a wrong one for DevRelease configuration(which is TestFlight)

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