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Thank you for contacting us. Please, my sincere apologies for the delay in answering.
Looking at your screenshot from the previous post, it looks like this "Certification" post type is not marked as translatable.
Please, open the post type translation and at the bottom of the page, select the "Make Certifications Translatable". I'll attach an image for you to see. After that, synchronize the custom post taxonomies again.
Please, let me know if I can help with any other questions you may have. I'll be happy to help.