Companian app with tailscale fails to connect

I added tailscale to my home assistant configuration.
Works fine when I approach home assistant in the webbrowser of my Android phone.
However it fails when I use the comanian app.
I tried all options for the external address I can think of:
With or without portnumber, the local ipaddress, the tailscale character address.
following this youtube : (https://www.youtube.com/watch?v=vDxmtRByXDY&t=9s) I added this to my configuration yaml:

http:
  use_x_forwarded_for: true
  trusted_proxies:
    - 127.0.0.1

What am I missing