Wesley, this is probably why.
From the LEGO Universe Reborn forums:

„2015-12-04 15:50:44 – Re: Banned after creating an account?
ADMIN
Egmo
You have to be accepted into the database, you were just accepted. Along with other users.
2015-12-04 15:54:28 – Re: Banned after creating an account?
ADMIN
Egmo
If you’re banned while being registered as a new player, you have to wait for us to accept your username!“