Automatically subscribe WordPress users not working – or I did something wrong

I enabled the “Automatically subscribe WordPress users” option in the admin panel and when new WP users are added (they sign-up for bbpress but are put in the WP database and log-in asWP users) I do not see their email address added to the list of subscribers.

Should I be doing something else to make this happen or is there some other option I should be ticking to activate this?

Thanks,

L