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This thread is resolved. Here is a description of the problem and solution.
Problem: When the product page is accessed, shows 404 error, page not found.
Solution: If this is only happening in some old products, you should remove the variations and add them again.
To do this, go to the product that is not working properly and follow the steps below:
- Look at the "Product Data" box - Click on the "Variations" tab - Remove the variations - Insert the variations again - Click on the "Save changes" button - Update the product page by clicking on the "Update" button
Relevant Documentation: https://wpml.org/documentation/related-projects/woocommerce-multilingual/#taxonomies