This issue is related to 🐛 Interest groups as radio buttons do not work Needs review but for signup forms (in block or page).
When creating a form with a 'radiobutton' interest group in mailchimp, the drupal signup form will not send this correctly to mailchimp.
This because a radiobutton does not return the expected array.
This can however be fixed seperately.
Closed: won't fix
1.0
General
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
Thanks for submitting this ticket — and sorry we didn’t get back to you about it sooner. We are cleaning up old issues and issue for old versions and are going to close this one. If this issue is still relevant for you, please re-open it and update the “Version” field, and include any updates to the behavior you are seeing.With a smaller issue queue, we’ll have an easier time getting back to you.