Go figure… The second I make the post, it starts working.
When I try to log in to Steam in the game launcher, it acts like its logging in, then just goes immediately back to being logged out. Because of this, I’m not able to use mods. It does this when I launch it both through steam or my desktop, and if I launch it through steam with the ‘Start without launcher’ option selected, still none of my subscribed too mods show up.