James

Problem:
You are trying to view the Translation Dashboard on your site but encounter an error message indicating that the REST API test endpoint is not responding correctly, despite it being valid when tested.
Solution:
We moved your site to a minimal environment, switching the theme to 2024 and deactivating all plugins except WPML. This process helped us identify that the WP-Ban plugin (https://wordpress.org/plugins/wp-ban/) is causing the issue. This plugin has not been tested with the latest three major releases of WordPress and is not officially compatible with WPML. We recommend deactivating the WP-Ban plugin to resolve the error.

If this solution does not apply to your case, or if it becomes outdated, we highly recommend checking related known issues at https://wpml.org/known-issues/, verifying the version of the permanent fix, and confirming that you have installed the latest versions of themes and plugins. Should you need further assistance, please open a new support ticket at WPML support forum.