This thread is resolved. Here is a description of the problem and solution.
Problem:
The client was unable to update existing products to a specific brand, modify the product category, or change the product images. Additionally, there was an issue with product images not updating correctly in the translated version.
Solution:
We recommended the following steps:
1. Navigate to WCML > Status > Troubleshooting and run the option "Duplicate terms (please select attribute)" to fix the initial issue.
2. Edit the primary language of the product and click "save/update".
3. Retranslate the product to ensure that the brand and category updates are copied to the English language product.
For the issue with the images not updating on the translated page, we have split the ticket and are addressing it separately here.
Please note that the solution provided might be outdated or not applicable to your specific case. We highly recommend checking related known issues at https://wpml.org/known-issues/, verifying the version of the permanent fix, and confirming that you have installed the latest versions of themes and plugins. If the issue persists, please open a new support ticket.
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This topic is split from https://wpml.org/forums/topic/in-the-translation-backend-interface-brands-are-unavailable/