Hello Mike,

the sitemaps need to be managed one per each language, you can't mix multiple languages in the same sitemap. having specific sitemaps for each language improve Google indexing. With the dropdown of the language switcher in the SEO dashboard you can easily set links for both languages on your site for XML.

The Joomla language manager will do the rest and also for the HTML sitemap attached to menu items the language will be switched.

More informations can be found in the pdf documentation of the component.

Thanks and regards

John