Configuring Keycloak as OIDC provider for Tailscale

Hi guys,
I’m struggling to configure Keycloak for Tailscale. (I’m also unsure how to set up webfinger since I’m using Traefik for my web server). Specifically what do I enter for the general settings (e.g. root URL)? I entered the callback URL for the Home URL, for now. Do I need to set anything else?