EDIT: FIXED IN Advanced Pack 1.18.0
When a user syncs a targetlist to a mailchimp group you store both the grouping and the group Id. This is correct, however you then use the grouping ID rather than the group id to make the subscription request.
MailChimpManager.php:632 should be : $subscribeElem = $this->getRecipientHelper()->formatSubscriber($parsedRecipient, false, $targetList->get('mcListGroupId'));
When a user syncs a targetlist to a mailchimp group you store both the grouping and the group Id. This is correct, however you then use the grouping ID rather than the group id to make the subscription request.
MailChimpManager.php:632 should be : $subscribeElem = $this->getRecipientHelper()->formatSubscriber($parsedRecipient, false, $targetList->get('mcListGroupId'));
Comment