This thread is resolved. Here is a description of the problem and solution.
Problem: The client needed to translate the slug of a user role generated by their theme, but WPML does not support the translation of user role slugs. Solution: We explained that WPML cannot translate user role slugs directly. However, we suggested that if the roles are presented using Custom Post Types (CPTs), they could be translated using WPML's standard translation features for CPTs. We provided documentation links for translating user meta information and CPTs:
I recently opened ticket (https://wpml.org/forums/topic/changing-slug-of-a-user-role/), upon which you or a colleague of yours responded. However, I was so busy with everything else besides the website, that I did not have time to respond and the ticket got closed. Is there a way to pick up where we left? I'd gladly provide access to the website.
However, can you please explain a little more that where these roles are coming from and how do you access these in frontend (i.e. example URLs)? So I can check with my team for any possibility.
Well, I meant about the technical details for understanding how the roles and slugs are being generated. For example, some can use CPTs (Custom Post Types) to create such things while presenting as mocked roles. In this case, CPTs can be translated via WPML (https://wpml.org/documentation/getting-started-guide/translating-custom-posts/).
But the actual user role slugs, can't be done with WPML.
I you prefer, I can to take a closer look at your site. So I request temporary access (WP-Admin and FTP), preferably to a test site where the problem has been replicated.
Your next answer will be private, to share this information safely.
Also provide detailed steps to reproduce the issue and links to pages in admin and on frontend.
IMPORTANT: Please take a complete backup of the site to avoid data loss. I may need to activate/deactivate plugins also.