Why can't my device (Raspberry Pi OS) find apps in Flathub?

I’ve followed the instruction guide (How to Install Flatpak on Raspberry Pi) to a T, but I can’t do anything. Is there something I’m doing wrong, is it no longer compatible with Raspberry Pi OS, etc.

You need Raspberry Pi OS 64 bits.

it’s mentionned on the setup documentation linked from Flathub:

https://flatpak.org/setup/Raspberry%20Pi%20OS

Thanks! Not sure how I missed this.