Thank you for contacting WPML support. While you are waiting for one of my colleagues to take this ticket and work on it, let me provide you with first debugging steps or if I can perhaps help with the issue quickly.
I tested quite a few of the links you shared and I'm not seeing a 404 error on any of those pages. The pages are loading as expected. So I'm not sure why your crawl would return 404 errors for pages that exist. WPML doesn't control the crawl, it just handles the URL format for the languages and the translated content. What are you using to crawl your site? I suggest reaching out to the support there and asking why a valid URL would return as a 404 page.
If you need further assistance with WPML, please let us know and the next available supporter will be happy to help.
Interesting. The error was there. Maybe it was some sort of cache Issue. After around a day the issue was gone. We'll keep an eye on this - and test with caching next time.
Thanks a lot
Johannes
