This thread is resolved. Here is a description of the problem and solution.
Problem:
The client was unable to see multiple choices of size for a product on their multilingual website. The product variations were not displaying and weren't linked to any attributes.
Solution:
First, we addressed a redirection issue by changing the "Language URL format" in WPML > Languages > Language URL format.
For the issue of missing attributes on the translated product page, we recommended running the WCML Troubleshooting options available at WCML > Status > Troubleshooting. This action resolved the problem with product variations not displaying correctly.
If this solution does not resolve your issue, or if it seems outdated or irrelevant to your case, we highly recommend checking related known issues at https://wpml.org/known-issues/, verifying the version of the permanent fix,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 do not hesitate to open a new support ticket at WPML support forum.
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