Playing Heroes of Might and Magic V on Ubisoft servers.

Hey everyone, I read the topic and didn't see a single reply... about the same problem I'm having... the key worked on Uplay, I registered... then I enter my login and password, and it says "loading" and then kicks me back to the previous page in the game, i.e., the page where you have to click on Uplay and enter your login and password... why is this happening? And what do I need to do?