Am still running into this myself. I've been keeping an eye on the PO site to see what information that they provide on there for updates (which has been every 3 hrs since last update - last one is now 1PM (GMT) [6:00 AM PDT / 13:00 PM GMT / 15:00 PM CET] )
And you don't need to worry about capitalization as the system automatically capitalizes every letter in your code.