[Resolved] language flag with mass import using wp all import

Problem:
The client is importing products in two separate files for English and Greek languages, setting the correct WPML language flag for each (en for English, el for Greek). However, after import, the language selector for the other language is missing on the product page, indicating that the products are not 'connected'.
Solution:
We recommend following a specific workflow when using WP All Import Pro and the WPML add-on to import related content in multiple languages. It is essential to use a unique identifier that is present in both the original language import and the other language import to connect the individual posts. This unique identifier is different from the product ID or the 'WPML Translation ID'.
Please review the detailed steps described in our documentation to ensure you are following the correct workflow:
Importing Multiple Languages with WP All Import and WPML
Additionally, you can find information on how to add a unique identifier to your spreadsheets here:
How to Add a Unique Identifier to Your Spreadsheets

Please note that the solution provided might be outdated or not applicable to your case. If after checking the documentation and ensuring you have the latest versions of themes and plugins the issue persists, we highly recommend opening a new support ticket. You can also check related known issues at WPML Known Issues and verify the version of the permanent fix.