Troubleshooting

• “Your API key has expired” or key rejected: the page opens on the API Key tab with the Mailchimp message. Create a new key in your Mailchimp account and paste it.
• “Could not resolve host” or Mailchimp unreachable: the server cannot reach the Mailchimp API. Ask your host to allow outgoing HTTPS connections to the Mailchimp API (*.api.mailchimp.com).
• Operations in error in Mailchimp: start the error analysis; each cause is explained, with what to do.
• Nothing is sent in real time: check that the audience of the language is chosen and that the initial synchronization of the type concerned has been done.
• Orders are not sent: the store must be associated (Products tab) and the catalog synchronized; enable “Controlling all products” if orders are rejected because of a product that no longer exists.
• Mailchimp unsubscribes do not come back to PrestaShop: the shop must be reachable over HTTPS and not in maintenance mode; behind a WAF, have the webhook route allowed (see Security). Catch up the gap with Apply Mailchimp unsubscribes.
• Signups from the newsletter block do not arrive: in Advanced Parameters > Performance, check that overrides are not disabled, then clear the cache.
• A server error in the synchronization window: the exact message (class, file, line) is displayed; send it to support.

Switch the Logs tab to Record all actions while diagnosing.