If I remember correctly from past years, the 400 code is for the application, and the 500 code is if you draw the tag. So, having a 400 code doesn't necessarily mean you didn't draw (everyone that applies will show a 400 code), its the lack of a 500 code that means you struck out. So don't get discouraged if you log in the first time and only see a 400 code, its when the 500 code doesn't show up that you can let the disappointment set in!