I had actually tried to sign up when registration first opened. I got the confirmation at the time of being registered. I just assumed everything was taken care of, and saw that when I went to check on why I had not gotten an invite yet.
Ubisoft beta registration has always been ass for me. I think they try to make the process too flashy. Most other games I just have to put an email or something in.
Wait so you're trying to register for the beta again? Or are you trying to enter the tech test code? Any further clarification would be awesome.