Title: Invalid API DeepL
Last modified: February 16, 2026

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# Invalid API DeepL

 *  Resolved [sergiogordilloq](https://wordpress.org/support/users/sergiogordilloq/)
 * (@sergiogordilloq)
 * [3 months, 1 week ago](https://wordpress.org/support/topic/invalid-api-deepl/)
 * The error occurs because DeepL no longer accepts the old authentication method.
   You now need to use the HTTP ‘Authorization’ header with your API key. Make sure
   TranslatePress is up to date and compatible with this method.
   I have the plugin
   updated to the latest version, and it still won’t connect to the API.Can you 
   help me?{“message”:”Legacy authentication method ‘form body’ is no longer supported.
   Please update to header-based authentication. Find more details in our docs: 
   [https://developers.deepl.com/docs/resources/breaking-changes-change-notices/november-2025-deprecation-of-legacy-auth-methods](https://developers.deepl.com/docs/resources/breaking-changes-change-notices/november-2025-deprecation-of-legacy-auth-methods).
   You can find more info in our docs: [https://developers.deepl.com/docs/getting-started/auth&#8221](https://developers.deepl.com/docs/getting-started/auth&#8221);}
    -  This topic was modified 3 months, 1 week ago by [sergiogordilloq](https://wordpress.org/support/users/sergiogordilloq/).

Viewing 1 replies (of 1 total)

 *  Plugin Support [Iarina](https://wordpress.org/support/users/iarinadasdi/)
 * (@iarinadasdi)
 * [3 months, 1 week ago](https://wordpress.org/support/topic/invalid-api-deepl/#post-18824158)
 * Hello [@sergiogordilloq](https://wordpress.org/support/users/sergiogordilloq/),
 * Thank you for contacting us!
 * Unfortunately we are not allowed to speak about the paid versions here, including
   features related to automatic translation. In case you would like to have that
   conversation, please open a support ticket using our site: [https://translatepress.com/support/](https://translatepress.com/support/).
 * Please also point out that you have already contacted us on the WordPress forum
   and add a link to the conversation in the ticket you will create.
 * Thank you for your understanding!

Viewing 1 replies (of 1 total)

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 * 1 reply
 * 2 participants
 * Last reply from: [Iarina](https://wordpress.org/support/users/iarinadasdi/)
 * Last activity: [3 months, 1 week ago](https://wordpress.org/support/topic/invalid-api-deepl/#post-18824158)
 * Status: resolved