How to share Preferences in a Xamarin.Forms project between an iOS and iOS extensions?

I'm trying to get a string (UserID) using Preferences.Get (Xamarin.Essentials) on a PushNotification.Extension project, but as the Preferences.Set happens in the Xamarin iOS project, I'm always getting an empty string in the extensions project.

Is there a way to share this preference between the iOS project and the iOS.extension?

public string UserID
{
    get
    {
        return Preferences.Get(nameof(UserID), UserIDDefault);
    }
    set
    {
        Preferences.Set(nameof(UserID), value);
    }
}

According to Apple docs , please follow the steps to enable data-sharinig .

1. Enable App Groups Capabilities , refer to App Group Capabilities in Xamarin.iOS.

2. Add the app to the App Group .

3. Use NSUserDefaults and init it with the name of the extension bundle identifier.

//Save 
var defaults = new NSUserDefaults(@"com.example.domain.MyShareExtension");
defaults.SetString("value","Mykey");
defaults.Synchronize();

//Get
var defaults = new NSUserDefaults(@"com.example.domain.MyShareExtension");
var value = defaults.ValueForKey("Mykey");