The password change form on SquareEnix's Account Management site has JavaScript that disables pasting into the "Re-enter your password" field by checking if the combination Ctrl+V was pressed on keydown.
This does not give me confidence.
It is almost as if it was fundamentally designed to discourage good password management habits in the first place to sell their proprietary 2fa token instead of allowing you to use your own TOTP.
Double fucking whammy: The launcher overrides the use of Ctrl+A and Ctrl+Z in the credential fields?
Why?
SquareEnix, it's fucking 2019.
I really, really wish that SquareEnix didn't come up with a proprietary 2FA solution. It all but guarantees that I won't use it because I absolutely do not trust them to maintain their proprietary mobile app for it.
I have strong feelings about this because of how horrifically managed FFXI was and frankly still is with regard to account management.
If you want Auto Fill in KeePassXC to work in the FFXIV Launcher, make sure Remember ID is turned off and use the following Sequence:
{TAB}{PASSWORD}{ENTER}{USERNAME}{ENTER}
The window title is FFXIVLauncher.
This only works if you don't use a 2fa token, and takes advantage of a weird quirk where pressing Enter on the Password field when the Username field is empty places the cursor focus on the Username field.