If it's not one thing, it is something else. After trying to re-install the client and game completely, I've been hitting this error every time I try to log into my main character who's current location is in Rhalgar's Reach. However, my alt, who is on the same server, has no issue logging in who is currently in Limsa.

This would lead me to believe it's something dealing with Stormblood, but I have the game registered and everything.

Character: Lorielle Kurayami
Data Center: Aether
World: Cactuar