Customers outside the german speaking countries may have bought their software from other distributors or their resellers. Some of these licenses can not be updated by the S.H.I.E.L.D. Agency directly. If you place an update order and there is a question regarding the update-process - no problem. You will be informed and get the code.
The generation of the new license just may then take a little longer and maybe you have to mail in a screenshot or bill to prove the update status. But this should be no big deal and only effect a few customers.