It's not our account (it belongs to a client), but we have found that this happens with one of our accounts if the user that authenticated has been invited as an administrator (i.e. is not the user that *started* the account.. So this may be the reason.
How would we allow anyone on the account to allow this?
"Dean Lukies (Adsense API Team)" <firstname.lastname@example.org>: Mar 27 08:52AM -0700