What is a one-time password? Can't access my Square Enix account

I signed up to a SE account some time ago, it was the only time I logged in their account system. When I tried accessing it again yesterday to pre-order a game from their store it asked me to login with my SE account, which requires 2 passwords? I'm sure I signed up with 1 password, I even

XIVLauncher Authenticator App

How to access FFXIV Online: one-time password, free trial version - Dexerto

I created a Square Enix account to play Final Fantasy 14. But how do I get a one-time password to log into FF14? - Quora

SQUARE ENIX The Official SQUARE ENIX Website

Two-Step Verification Square Support Center - US

Final Fantasy XIV: Collector's Edition (PS3) : : PC & Video Games

How to access FFXIV Online: one-time password, free trial version - Dexerto

I created a Square Enix account to play Final Fantasy 14. But how do I get a one-time password to log into FF14? - Quora

Using a Square Enix Account, FFXIclopedia

FINAL FANTASY XIV Forum

How to enable automatic OTP entry in FFXIV · GitHub

SQUARE ENIX The Official SQUARE ENIX Website