wp-json/contact-form-7/v1/contact-forms/3453/feedback – 404 NOT FOUND

Hi, I’m getting an infinite spinner when I try to submit my forms. This due to the plugin not finding the response file.

I have searched through different support-threads, whereas this is the closest one: https://www.ads-software.com/support/topic/contact-form-7-wp-json-404-error/

However, changing settings in my .htaccess did not solve the problem.

Do you have a fix for this?

The page I need help with: [log in to see the link]