This thread is resolved. Here is a description of the problem and solution.
Problem: Error in attribute synchronization in WC Multilingual
Solution: This is happening because the Product Attribute taxonomies translation preference is set as *Not translatable*. We have to choose *Translatable - only show translated items* or *Translatable - use translation if available or fallback to default language* option for it in WPML>>Settings>>Taxonomies Translation.
Relevant Documentation: https://wpml.org/documentation/related-projects/woocommerce-multilingual/#taxonomies
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