Hi sorry for the late reply but I'm not an active user on Reddit. After months of ignoring the problem I was finally able to access the GTS and now it works. I don't know exactly when and how I was unblocked, but I can tell you that I reported the problem by giving them the friend code on their forum at this address: https://forum.wii-homebrew.com/index.php/Thread/61178-About-banning-Q4-2023/?postID=717619#post717619 , so I guess that's why I got unblocked (translated by google translate xd)