Getting AutoHotkey to work with Steam (specifically Final Fantasy V)

Hello all,

I've been working for a few hours on trying to get AHK to work properly with Final Fantasy V (run through Steam) with no luck.

I found a short script that just presses up and down in a loop, which is all I need, but for the life of me cannot figure out why it's not working in-game.

The script itself works fine. Whether in file explorer, a web browser or even the Steam IM, it will press down, up to infinity. However, in the FFV window, it does absolutely nothing.

Pressing the keys manually with the keyboard works fine. They are mapped correctly.

I did some searching and have seen a few peoples threads about running AHK in Administrator mode, or enabling the AHK UI Access to try to get AHK to work with games like Terraria. I've tried all of these with no success.