[@nativescript/google-signin] - Signin does returns undefined for serverAuthCode

While implementing the pacakge i see that in the response the serverAuthCode comes as undefined. I do get accessToken and the idToken. Because of the way our backend works we need the serverAuthCode . Is it know to not be working or might i be doing something wrong?
i'm configuring it like this
GoogleSignin.configure({
signInOptions: 'default',
clientId: environment.google_login_ios_client_id,
serverClientId: environment.google_login_server_client_id,
});
in the main.ts of the app before starting the app up
Using the versions:

• "@nativescript/google-signin": "^2.1.1",
• "@nativescript/core": "~8.9.2",

Reproducir el flujo de inicio de sesión a partir de la configuración mostrada en main.ts usando @nativescript/google-signin 2.1.1, e inspeccionar cómo el paquete gestiona serverClientId y serverAuthCode. Comparar la respuesta con los valores de accessToken e idToken indicados; se considerará terminado cuando se determine si debe devolverse serverAuthCode o se documente la limitación y la configuración necesaria.