I have installed Dark Souls from Steam, and try to play it online, but is asked to log in on GFWL. I have an account, on which Dark Souls is registered, but in order to log in, it keeps asking me to 'Enter the product key', and when I do it tells me that the product key is registered with another Live ID.
I do not have more than one Live ID (as far is I know), and when I log into my account through a browser, Dark Souls is on the list of games.
Any suggestion? Is it possible to see my key in the GFWL account?