Accidentally signed up on amazon.com and now I can not register on European Market

Hello everyone, I am a new seller and when I signed up on Amazon I did not see any European Marketplace to choose from and I chose the U.S. and I was pending registration for Saudi Arabia, Egypt, Canada, Singapore, Australia, every possible marketplace but not Europe where I need to sell. Now, I clicked on sell globally and chose Europe to register on that market but I keep getting errors like invalid URL. Before that they told me that I need to finish registration on the other marketplaces and I did cancel the registration but no success.I opened a case log but unfortunately they said I should contact EU support but how can I contact them if I can not register for Europe. Then I tried to register on Seller Central Europe with a new e-mail but they do not accept my registration and refuse my documents. I do not know what else to do.