application: UIApplication, continue userActivity: NSUserActivity, restorationHandler: @escaping ([Any]?) -> Void) -> Bool { } not called

I implemented Universal Link using Firebase Dynamic Links in my iOS app. Everything is working fine until app opens from background state i.e., continue userActivity method triggered and I handled navigations. But the problem here is, if I click any Deep Link while app is in terminated state, it is opening the app without navigating to particular screen, because the continue userActivity method not called so the navigation code not executing. Can you please help to figure out solution.

The problem is that you are returning false from didFinishLaunching. That prevents continue from being called.