I'm also interested, the event clearly says in the event tab that you can get a master SS ring, so the event itself it not flawed. I also forgot and bought 15 boxes and a ring already.
I never had a problem logging in from Hungary. But during DMT, I could not log in for the entire hour. The reward points are still showing "0", so I cannot buy a single cube with RPs. As soon as DMT ended, I could play no problem. I hope we get anot…