After I upgraded my PHP version from 7.4 to 8.3, I received a notification about the minimum WPML requirements.
The WordPress REST API must be enabled for WPML to work correctly.
The REST API test endpoint hidden link is not responding correctly.
Despite the warning about minimum requirements, this is a false positive in most cases—especially if visiting the URL returns a valid REST API test endpoint response, such as:
This issue does not affect WPML functionality and is scheduled to be permanently resolved in WPML 4.9. The first workaround has already been included in version 4.9.0-b.2 (see the changelog here: https://wpml.org/download/wpml-multilingual-cms/?section=changelog). I don’t have an exact release date for the final version, but it will possibly be released in January.