1. authelia

first, go to authelia.cliny.net, check 'remember me', and log in

your username is your email address

if you get 'incorrect username or password', hit 'reset password?', or confirm that you are using the correct email address

authenticate some thangs

2. jellyfin

go to jellyfin.cliny.net. this must be done via a web browser (eg firefox) because jellyfin SSO generally won't work anywhere else (eg android app)

hit 'authelia'

check 'remember consent' and accept the consent request

then log in to other devices (eg android app) by using quick connect

watch some thangs

go to jellyseerr.cliny.net, and hit 'authelia'

check 'remember consent' and accept the consent request

request some thangs

if you can't log in to jellyfin, delete the current cliny.net server from the app, and start again from step 1

to fix playback issues, wrong audio, subtitle settings, etc, go to your jellyfin settings and change things

to fix issues with movies/shows, you can report an issue in jellyseerr

all good