You should still receive the registration confirmation e-mail even with the error. At least that's what happened to me. Also, if you log in your Roxio MyAccount, you should see Toast 10 listed in Your Registered Products.
do you have anything listed as subscribed right now? It's likely that you did not configure your setting properly since you are the only one with issue on forum notification.
As a last resort, you can change your e-mail address for the forum account to a different one.