Unable to install Home Assistant Supervised on Debian 12.2

I followed the instructions here: GitHub - home-assistant/supervised-installer: Installer for a generic Linux system

But getting the following error:

$ sudo apt install ./homeassistant-supervised.deb
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
Note, selecting 'homeassistant-supervised' instead of './homeassistant-supervised.deb'
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
 homeassistant-supervised : Depends: os-agent but it is not installable
E: Unable to correct problems, you have held broken packages.
$ sudo apt install os-agent -y
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
E: Unable to locate package os-agent

This is with a clean install of Debian, on a fresh drive. The only other thing I installed manually was sudo and I added my own user account.

Nevermind, I totally missed Step 3 on that page which clearly gives instructions on installing os-agent.