Currently, we have stopped allowing the creation of new characters in the following worlds:

Ultros
Behemoth
Cactuar
Diabolos
Gilgamesh
Leviathan
Balmung
Excalibur
Hyperion
Tonberry
Mandragora
Bahamut
Chocobo

At present, login restrictions are gradually being eased, and cases wherein players are unable to login are decreasing. We will continue to carefully monitor and control the situation so that we may provide you with the best gameplay experience possible.

In the event of any changes in the situation, follow-up news posts will be posted here as well.

We apologize for any inconvenience this may cause and thank you for your cooperation and understanding.
I got this from here

My friend wants to join me in Behemoth also but guess what... he can't