Can't log into WT wiki with my Xbox account

A friend told me that I could test drive removed vehicles in the premium section in the wiki page. Like the Maus or the E-100 for example. So I go in and see them, click "show in game" and asks me to log in, so I try. I'm on Xbox and obviously I'ma use my Xbox live account, but when I click it, it doesn't do anything, no log in no "show in game" nothing works. Anyone know why?