The request token for this page is invalid. It may have already been used, or expired because it is too old. Please go back to the site or application that sent you here and try again; it was probably just a mistake.
I keep getting this message, not sure what I'm doing wrong but I have successfully authorized apps in the past using a similar link....
Can't say for sure, but that sure looks like an access token and not a request token. The access tokens all seem to have the format of the user id followed by a "-" and a code. Request tokens do not have the user id prefix.