me and some of my friends who got the game as gifts from "bought as guest" are having a similar issue
they never emailed and updated code, the old email when you click to register the game just says "this copy is not valid"
it revoked endwalker completely
which is dumb cause you cant BUY THE EARLY ACCESS WITHOUT BUYING THE GAME
idk why we have to enter 400 codes to start with but that aside, there has been no responce from customer service and the call center is closed till monday. so