Hello,
Thank you for the quick response the other night, unfortunately I wasn't able to follow up until this evening, but upon further investigation I think I see where some of my misunderstanding is, and hope that this is something you are able/trying to implement in the future.
It looks like everything works fine, when you are registering an account, i get the two test lists I have setup, and am able to select which of them or both that i might want to be subscribed to.
What I thought would be working in addition to this is that when i went to edit my profile under community builder, and went to the newsletter subscriptions tab, where it currently shows me the lists that are available/subscribed (and as super admin I do indeed see the list numbers), i thought a user would have the ability to add more subscriptions by checking other list(s) they were not intially on, or to unsubscribe by unchecking a box, thus generating the api calls to constant contact to do this. Thats what appears to not work and doesn't work as such on your side either so I don't think its me, but rather something not yet implemented.
Ideally I would want my users o be able to choose to subscribe and/or unsubscribe from lists right from my site using their CB profile tab for the newsletters.
Thanks again!
Stephanie