well , want to ask if this is working or not.
my serve no one owns
and i cant register (my clan got castle) , i try also with a lvl 8 clan box cant also.
if your clan have castle you can participate only for hot springs and/or bandits clan halls. for hot springs you need to catch hotsprings war declaration. for bandits.. there is time when you can sign for siege.
and you can sign for ch siege only in siege week. on thursday if i'm not wrong.