My brother got a new Xbox 360 for his birthday today as well as a 12 month live gold membership. All sorted & activated. My dad bought me a 1 month gold membership so I could play on live with him on his console. I set up my xbox live account on this website including my gamertag. But now I can't seem to be able to sign in to live on his console as it asks me to set up a new profile and when I put in the details of the one I created on this website it tells my this gamertag is already in use!
My question therefore is - Is it possible for 2 people to sign in at the same time with their live profiles on the one console?