If customer names are missing from the connected list, this is most likely because the merge fields for the first name and last name have been renamed. The default setting in MailChimp is “FNAME” for the first name and “LNAME” for the last name. If different settings are required, the name can be synchronized retrospectively using this plugin: https://store.shopware.com/jett880123383245/mailchimp-merge-field-synchronisation.html
