Allan Tépper

Problem:
You are seeing a persistent message: «Please activate the WPML String Translation plugin to convert Rank Math Setting values in different languages.» even though the WPML Multilingual CMS is active and registered, and the WPML String Translation shows as «Registered».
Solution:
The issue originates from the Rank Math SEO plugin. We have already contacted the plugin authors to address this. Meanwhile, we recommend following the workaround provided here: https://wpml.org/errata/rank-math-seo-false-string-translation-activation-notice/. Please ensure to back up your site before making any changes.

If this solution does not apply to your case, or if it seems outdated, we highly recommend checking related known issues at https://wpml.org/known-issues/, verifying the version of the permanent fix, and confirming that you have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.