Membership 2 not adding users to Mailchimp list

In membership 2 mailchimp addon when settings are as follow:

The users signup for the free membership but they are not subscribed in the Tips for entrepreneurs list. In fact, when checking that list it appears that the email actually unsubscribed from that list.

And when settings are as follows:

The user signup for the free membership and the user appears subscribed on the Tips for entrepreneurs, which doesn't appear in the settings.

Staff access enabled.