TL;DR: Verify your account to get access to the game, you should have received a verification link in the initial sign up email.
The rather persistent ddos that's going on since some time last week started doing something new today and created 150000 forum accounts and used those to try to login via the auth server, the very first login of an account is a comparatively expensive operation and eventually the ddos overwhelmed the auth server. The fact that you were able to log in to the game at all with an unverified account was an oversight that has now been corrected.
Actual players affected by this will have to verify their account, the initial sign up email contains an activation link and you should also be able to request that email again. Once you clicked the verification link it can take up to 2 minutes for you to be able to log back into the game.
The rather persistent ddos that's going on since some time last week started doing something new today and created 150000 forum accounts and used those to try to login via the auth server, the very first login of an account is a comparatively expensive operation and eventually the ddos overwhelmed the auth server. The fact that you were able to log in to the game at all with an unverified account was an oversight that has now been corrected.
Actual players affected by this will have to verify their account, the initial sign up email contains an activation link and you should also be able to request that email again. Once you clicked the verification link it can take up to 2 minutes for you to be able to log back into the game.