Yeah I got the same problem. The product key provided in the game info panel is invalid. So I contact customer support who the first guy was pretty nice, but I had to uninstall my Mass Effect 3 install and clean the registry's etc. Anyways after the lengthy process of unistalling, reg cleaning with ccleaner then redownloading (2-3hrs) he sent me a new game and new product key which was again invalid. So I fired up Customer support again then get a an unhelpful support guy who tells me that every copy of mass effect 3 has the same problem and the "team" is working to fix it. My ticket has been closed and marked as "resolved" when I clearly told them to keep it open until the issue is fixed. So I'm onto Customer support again...
