@Shuri_kun It was always the case. Most authenticators allow a 2-3 minute delay, but once a code is used, it becomes invalid. Most hardware authenticators tend to drift by a few seconds each year, which is why manufacturers recommend replacing them every 10 years.
Square Enix has closed new player registration for Final Fantasy XI’s largest server, Asura, due to overpopulation.
They are exploring ways to balance populations across worlds and may reopen Asura to new players later.