Membership not enabled?

I am trying to get the membership plugin working, but have not had a great deal of success. I activated the plugin at the subsite I want to control membership at, but the registration (disabled at the top level site) for a new user gets redirected to the main install saying "registration is not enabled"

How do I get it to use the Membership Registration on the subsite? Yes, multisite is setup with BuddyPress install also at the subsite.

The toplevel site is