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Please try regenerating a new mailchimp API key and use it in your form integration. This usually fixes the passing data issue.
Please inform us if the issue persists after doing so.
I have just setup the mailchimp integration and seem to be encountering the same issue with my forms. Here is an example of a form that should be passing along the info, but is not: http://form.jotform.com/form/12270124743
I have also tried to generate a new key as suggested, but that does not resolve the issue. Can you help please?
I've moved your question to a new thread and shall be addressed there
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