Your account not only needs to be an administrator, but the "Account Holder". I assume as it's financial documents, they need the person who owns the accounts that the money from IAPs is paid into. Apple's support for devs is truly awful. It's such a contrast to their support for consumers. From looking into this, I've seen threads that're open for years, with a dozen or so people having the same issue, and no response from Apple. Not to mention that lazily greying out a check box and leaving the developer to figure out what that means shows no consideration at all for the devs.