My main machine could only ever receive discord-1:0.0.115-1 which is too out of date to even launch (Discord's dumb policy).
My secondary machine had access to discord-1:0.0.116-1, the most recent version.
Both machines show:
cat /etc/pacman.d/mirrorlist
Server = https://mirror.omarchy.org/$repo/os/$arch
I used omarchy-refresh-pacman edge (command syntax is out of date with this manual page btw https://learn.omacom.io/2/the-omarchy-manual/66/other-packages) on my main machine. Now:
cat /etc/pacman.d/mirrorlist
Server = https://mirror.omarchy.org/$repo/os/$arch
And I can install the newest Discord version. I would rather remain on stable, and I can't explain the discrepency between the two machines.
All the info in this post was gathered after performing an Omarchy update and restart, and also pacman -Syu on each machine.