I am the Enterprise Admin...that's what I'm confused about, since I already went through their simple 3 steps to get started video which was essentially just flipping a switch in the Office 365 Admin area. I expected it to work right away, but then couldn't see where the actual main page for Teams was, so I kept on looking and eventually found it, but even so, it didn't seem to allow me to login yet...right now I'm chalking it up to them not being fully ready for everyone to use it.