Problem: The client is using WPML and Yoast SEO on a multilingual site with languages configured in directories. The issue is that the sitemap generated by Yoast SEO is showing URLs in the native language tripled, while secondary language URLs are not appearing, even after installing the WPML SEO plugin. Solution: We recommend that after installing the WPML SEO plugin, the client should flush the website cache, including server-side caches, to ensure that the changes take effect. If the sitemap still does not display correctly after clearing the cache, we advise the client to open a new support ticket for further assistance.
If this solution does not seem relevant to your situation, please open a new support ticket with us.