I am trying to create a ninja form for mailchimp newsletter subscribers.
So far it works well, but double opt-in is not working. Subscribers are directly added to the list. Double opt-in is enabled both in your plugin settings (ninja form builder -> emails and actions -> MailChimp -> use double opt-in: yes) and in mailchimp.com settings of the corresponding list.
Also, final confirmation emails are not sent by mailchimp.
Newsletter campaigns are sent correctly to new subscribers.
Any ideas what might help?
Thanks a lot for your time!
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