Whenever I try to use my reward dollar on the app, the app throws an error "Default. Sorry try again". Only when I don't use reward, it processes correctly. And when this error happens, the remaining amount actually gets charged from the card, but then refunded immediately. So it's not the card's problem. No matter what I try, changing restaurants, changing menus, changing payment types, etc, nothing works. Is this some sneaky way to block the use of reward dollars online?