Have you noticed that it states that next day's quota will be released at midnight Qatar time, not midnight zero one (00h01) as it was at the beginning? Maybe that's why the German contingent ran out at 23h03 already. As usual, it's impossible to get past submitting the form and getting a constant error message. I'm not very good at filling out these things very quickly, takes a good few seconds to go through the form again.
Another thought I have had, it might be worth clicking the submit button and really waiting for a bit longer (I am usually repeatedly clicking away to get it to go, and always end up with the error).