OK here we go:
I did loosely based on this guide: https://docs.goauthentik.io/integrations/services/home-assistant/
1- Install HACS add-on: https://github.com/BeryJu/hass-auth-header (Click on add repository and this link) 2- Create the Authentik instance and the outpost:
Type: proxy
Advanced settings:
authentik_host: http://authentik.yourdns.com