It's kind of funny, I initially tried Authentik and ran into issues getting it working, so I went with Authelia instead, but eventually went back to try Authentik again because I wanted to customize the CSS and felt I was outgrowing Authelia, and it just worked. Not sure what I was doing wrong the first time, but oh well.

I will say though the latest release has a major bug where worker instances are eating up db connections to the point where the entire thing crashes, so while I've generally been happy with it, definitely need to do some careful research before blindly upgrading.