Hi Predrag,
We have retested the forms on our end and you are correct, they are working.
It seems as if we may have been getting the error when we were attempting to sign up with an email address that was already on the list. We updated our MailChimp integration settings to allow emails that are already on the list to sign up, so we should be good to go.
Thank you again for your help!
– Adrienne
