confirm registration with deep link when auth window is closed

## Issue

Hey everyone, I have implemented auth flow with react native app auth + keyclock and faced issue. My registration flow consist of two steps:
1) I press sign up button, call `authorize`, is opened additional window with form, I fill data and get link on email that I have to press in order to confirm registration
2) I press link (deep link to my application with params like code, state ...) on email and I will be redirected to app

if additional window that `authorize` opened was not closed, I will get response (access_token, ...) from `authorize` and everything is fine
if additional window that `authorize` opened was closed, I need to log in

Is there way to handle deep link if additional window is closed? My goal it is that I press on link in email -> I am redirected to app (additional window can be closed) and I will get access_token
hope I explained clear
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## Environment

* **Your Identity Provider**: `keyclock`
* **Platform that you're experiencing the issue on**: `Android | IOS`
* **Are you using Expo?**: No

Inizia tracciando la gestione di authorize e deep-link descritta per Android e iOS in react-native-app-auth, quindi confronta la callback di registrazione di Keycloak con il flusso di reindirizzamento della libreria. Il lavoro è completato quando viene stabilito se una finestra di autenticazione chiusa può ancora recapitare il deep link dell’e-mail e l’access token, con un risultato riproducibile o una limitazione documentata.

Scritto dal modello di indicizzazione a partire dal testo della issue.