This thread is resolved. Here is a description of the problem and solution.
Problem: After configuring the subdomain and WPML, the secondary language redirects to the primary language.
Solution: This depends on how you configured the subdomain. The domain or subdomain must be an alias of the primary domain.
At the link below you can see our step-by-step documentation on how to set up your domain.
Relevant Documentation: https://wpml.org/2016/04/use-wpml-different-domains-per-language/
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