[Geschlossen] Translations not visible after moving website to Divi

Background of the issue:
I have an old website that was created in English using WordPress and translated to French and German using WPML (classic editor). I cloned the site using the Duplicator plugin and am rebuilding it with the Elegant Themes Divi Builder. I installed WPML and changed to the advanced editor. The site is now here: versteckter Link.

Symptoms:
I am unable to access the existing translations. The pages exist in various languages but are not linked in the back end. When I try to open the advanced editor on the German page, nothing happens.

Questions:
Why are the existing translations not accessible after moving to Divi?
What could be causing the pages to not link in the back end?