Soooo, I'm trying to use the U12 IComposer events to automatically assign members not in a group to a group, thus allowing auto registration.

Note: I have looked at the documentation for auto registration by subclassing the existing snippet, but I'd prefer to keep that stock and extend using events.

So far I have this, but it's not working, is this the right way of creating a Composer? Should this handle global member creation events?

using Umbraco.Cms.Core.Composing;
using Umbraco.Cms.Core.Events;
using Umbraco.Cms.Core.Security;
using UN = Umbraco.Cms.Core.Notifications;

namespace MyApp.Components
{
    // ================================================================================================================================================ 
    public class SubscribeToMemberSavedNotificationComposer : IComposer
    {
        public void Compose(IUmbracoBuilder builder)
        {
            builder.AddNotificationHandler<UN.MemberSavedNotification, MemberSavedNotificationHandler>();
        }
    }

    // ================================================================================================================================================ 
    public class MemberSavedNotificationHandler : INotificationHandler<UN.MemberSavedNotification>
    {
        public const string DEFAULT_ROLE = "Unapproved";

        public MemberSavedNotificationHandler(IMemberManager membermanager)
        {
            _membermanager = membermanager;
        }

        public void Handle(UN.MemberSavedNotification notification)
    {
        var unassignedmembers = notification.SavedEntities
            .Select(x =>
            {
                var user = _membermanager.FindByIdAsync(x.Id.ToString()).Result;
                var roles = user != null ? _membermanager.GetRolesAsync(user).Result : null;

                return new
                {
                    User = user,
                    Roles = roles ?? new List<string>()
                };
            })
            .Where(x => !x.Roles.Any());            

        foreach (var o in unassignedmembers)
        {
            if (o.User != null)
                _membermanager.AddToRolesAsync(o.User, new string[] { DEFAULT_ROLE });
        }
    }

        // ------------------------------------------------------------------------------------------------------------------------------------------------ 
        private IMemberManager _membermanager;
    }
}