Home Assistant Control Panel does not open


I had so much questions lastly, I hope this will be the last for some time.

I installed Controlpanel to use it on my old fire tablet.

My issue is that I’m not able to login into Controlpanel. I tried several url’s to log in.
Autodetect url: https://hassio.local:8123

I red the installation guide, but no success.

Which URL to I have to set in at CORS? Local or duckdns?

  api_password: YOUR_PASSWORD
    - http://addres.to.your.hass.io:7080

Maybe I should mention that I have letsencrypt and duckdns running.

Am I the only one with this issue?