To use a security token, it has to first be registered online. Only one user can use a single Security Token.

A six digit number One-Time Password will appear on the security token screen once the button is pressed.

This password changes after 30 seconds and needs to be entered before it changes.

When logging into the Square Enix Account, please enter the One-Time Password when prompted. On the FINAL FANTASY XIV launcher, enter the six digit number in the optional field that says "One Time Password" before clicking on "Login".