Trying to get Authentik Oauth2 to work

Hi everyone, I'm pretty noob at all this stuff and it's easier if I just ask experts. I've created an Authentik docker-compose and have got it successfully routing through my NPM on auth.domain.net. Screenshots of my configuration. I also have a pihole instance doing my internal DNS so I can internally access my domains rather than having to use IP addresses. Screenshots for those shown too. My immich docker-compose can access the internet and can also ping auth.domain.net. I think I'm getting request time outs after 30s when I click the "Login with OAuth" button when logging into Immich in an incognito browser. I get an internal server error on the login page too.