Title: Mailchimp API key returns invalid
Last modified: October 27, 2025

---

# Mailchimp API key returns invalid

 *  [sequith](https://wordpress.org/support/users/sequith/)
 * (@sequith)
 * [7 months, 2 weeks ago](https://wordpress.org/support/topic/mailchimp-api-key-returns-invalid/)
 * I’ve entered my Mailchimp API key correctly, but the plugin keeps saying “invalid
   credentials.” I tested it in another app and it works fine. Maybe there’s a region-
   based restriction or SSL issue with my server? Does your plugin require special
   permission scopes for Mailchimp connections?

Viewing 1 replies (of 1 total)

 *  Plugin Support [Jeffrey Paul](https://wordpress.org/support/users/jeffpaul/)
 * (@jeffpaul)
 * [7 months, 2 weeks ago](https://wordpress.org/support/topic/mailchimp-api-key-returns-invalid/#post-18697229)
 * [@sequith](https://wordpress.org/support/users/sequith/) you must be on an old
   version of the plugin as the primary integration from WordPress to Mailchimp 
   is no longer via API key. Please check that you’re on version 2.0.0, thanks!

Viewing 1 replies (of 1 total)

The topic ‘Mailchimp API key returns invalid’ is closed to new replies.

 * ![](https://ps.w.org/mailchimp/assets/icon.svg?rev=3156997)
 * [Mailchimp List Subscribe Form](https://wordpress.org/plugins/mailchimp/)
 * [Frequently Asked Questions](https://wordpress.org/plugins/mailchimp/#faq)
 * [Support Threads](https://wordpress.org/support/plugin/mailchimp/)
 * [Active Topics](https://wordpress.org/support/plugin/mailchimp/active/)
 * [Unresolved Topics](https://wordpress.org/support/plugin/mailchimp/unresolved/)
 * [Reviews](https://wordpress.org/support/plugin/mailchimp/reviews/)

 * 1 reply
 * 2 participants
 * Last reply from: [Jeffrey Paul](https://wordpress.org/support/users/jeffpaul/)
 * Last activity: [7 months, 2 weeks ago](https://wordpress.org/support/topic/mailchimp-api-key-returns-invalid/#post-18697229)
 * Status: not resolved