Chaos Ragnarok, same problem.

I'm trying out all my characters right now.

At first I thought it was because my main logged out on the island because I was able to log in to Gridania with the second one, but others who are also in the same place in Gridania can't log in either.

Out of 5 characters I can log in with 2, it doesn't work with the others, unfortunately my main is also among those that can't.

Main - island
4 chars in Gridania at the guild chest on the market (2 of which can log in)

Doesn't really make sense.