Ultimate Facebook "User registration is currently not allowed."

So I've seen a few other questions about this, but haven't found a solution yet. Here is what I have tried:

1. Wordpress network is set to "User accounts may be registered." is checked

2. On the main Ultimate Facebook setttings page:
- "Override individual blog settings" is checked
- Succesfully connected to App
- "Allow users to connect using Facebook" is checked"

I still get the error "User registration is currently not allowed." when testing creating an account with the facebook login.

I just created a new app and tried all solutions again, still the same error.

Any help is much appreciated! Thanks!