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Problem:
The client wants to change the default language of their multilingual website to Spanish and ensure that the domains for each language are set up correctly, while also transitioning from WPMUDEV's SEO SmartCrawl to RankMathPro for better compatibility with WPML.

Solution:
We confirmed that the client can change the default language to Spanish. After this change, the Spanish content will appear on the main domain without a language prefix (e.g.,

mallorcaguru.es/page

). Other languages will have new URL structures, such as

mallorcaguru.es/en/page

for English, or they can use their assigned domains.

This change might temporarily affect SEO visibility due to URL structure changes. We recommend consulting an SEO specialist for a deeper analysis. WPML supports mixing custom domains and subdomains for different languages, allowing configurations like:
- Spanish →

mallorcaguru.es

- Catalan →

ca.mallorcaguru.es

- German →

immobilienmallorcaportal.com

- Swedish →

fastighetermallorcaportal.com

- English →

mallorcapropertyportal.com

For more details on domain and subdomain configurations, visit our guide at https://wpml.org/documentation/getting-started-guide/language-setup/language-url-options/how-to-use-wpml-with-different-domains-per-language/

RankMath Pro is compatible with WPML for managing metadata, sitemaps, and hreflang tags for each language/domain. More information can be found here:

• https://wpml.org/documentation/plugins-compatibility/optimize-multilingual-websites-using-rank-math-and-wpml/
• https://rankmath.com/kb/multilingual-seo-wpml/

If this solution does not apply to your case, or if it seems outdated, we highly recommend checking related known issues at https://wpml.org/known-issues/, verifying the version of the permanent fix, and confirming that you have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. If further assistance is needed, please open a new support ticket at https://wpml.org/forums/forum/english-support/.