From audinoob via Discord :
We temporarily closed down the new user registration until we get updated registration system that includes proper authentication.
By limiting the number of alt accounts, our ban program would detect suspicious accounts more accurately and rapidly.
Also, it will help us proceeding 1 account - 3 characters synchronization update that we are currently preparing. So you do not have to repeat logging out and logging in again when you are using multiple characters to do garden, or to be couple with yourself just like most of us do.
Again, we are sorry for the inconvenience and thank you!”