Problems with being an Independent King in Westeros

I just declared independence from the Iron Throne and I have become Storm-King. But now I cant seem to recruit a new maester into my council. Whenever I click the “recruit a maester from the citadel” decision, I get the pop-up that says the maester arrived at my court and has been given the titles, but the maester remains in Old Town and I still dont have any available court physicians. I think I noticed that whenever the recruited maester event shows up, theres a notif that says some ramdom character arrived at my court, then when I check the character that character apparently has vanished. I think this has something to do with the emperor level title having to get a grand maester.