TOPIC: Error 400 when trying to submit a new subscription

I have the module setup in the sidebar of a Joomla site, and when I try to submit a new subscription, I get:

"Error 400: The resource submitted could not be validated. For field - specific details, see the 'errors' array."

Anyone have any idea how to fix this, or what's wrong? Or even how to access this errors array I'm supposed to be checking?

Do you perhaps have a required field in the mailchimp form, that you are not showing on the site?

Regards,
Daniel

Near as I can tell no. Where do I double check that?

Nevermind I found it, the only required field is the email and that's present. I double checked the MailChimp API and the list unique IDs, they all check out.

Here is a screenshot of the module setup, anything jump out at you?? This setup has been working for years, and near as I can tell nothing has changed, either on the site or on MailChimp.

Hey Kevin,
If you want send me access credentials to your website and I'll try to debug this.

Regards,
Daniel

Ok rather than publicly post an admin login to the site, is it possible to send you an email or private message on this board with the login credentials?

Haha, Nobody wants you to post those publicly I meant over email: This email address is being protected from spambots. You need JavaScript enabled to view it.

Emailed.