thebum06: Seems like they fixed this recently. And in the process they made a lot of people unable to access their prime account :/ My trial certainly doesn't work at least even though I signed up 2 days ago.
nagytow: I think it works, it's just your browser having problems with the cookies. The easiest way is to use a different browser. Alternatively log off your trial account (log off all services) and log back in.
The problem is most likely because fileplanet, which actually hosts all beta keys, is not aware of your trial.
I've tried Firefox, Chrome, and Internet Explorer. So I don't think it's a cookies thing. It's not just on fileplanet either, the official IGN site doesn't register it either and I have to follow a direct link to even access the management page. I'm far from the only one with this problem either, even paid customers who are not on trial have this problem.