Problem: You are experiencing issues setting languages for existing post categories after migrating from Polylang to WPML. Specifically, you encounter an error 'Category not updated' and notice that a duplicate category with a different URL is created. Solution: The root of the problem was that the original language for the category was set as Dutch (nl) in the database, and the Swedish and Norwegian blog categories were translations of this Dutch category, all sharing the same Translation ID (TRID). English had a different TRID, which caused the issue. We resolved this by changing the English category's TRID to match the others, linking all relevant categories correctly. If you have other categories that need similar adjustments, we recommend checking the TRID settings in your database.
If this solution does not apply to your case, or if it seems outdated, please visit our known issues page and verify that you have installed the latest versions of themes and plugins. If the problem persists, we highly recommend opening a new support ticket at our support forum.
