NabuCasa Remote control - can´t register application

I am trying to login with my URL (http://hassio.xxxxxxx.xxx) that points at NabuCasas remote-control URL. It is not possible to register application and complaining over “mobile_app” integration that is not enabled. I am using “default_config:”, I have also try to manual add “mobile_app:” but no difference…

If I do the same inside my LAN (WiFi) and with my ip-number to hassio, everything works. Also mobile_app registration works.
If I use a web-browser outside LAN with my URL (http://hassio.xxx) I can connect to hassio without problem.

No error inside my logs, what I can see, related to mobile_app or something that happens when I try to connect with mobile app.
In configuration.yaml and “base_url:”, I have set my http://hassio.xxxxxxxxx.xxx address now, is this maybe a problem ? Should I use my NabuCasa remote control address or something else ?
I have not configure SSL-related things on my hassio…

My mobile-phone is a Samsung S10 and updated.

I am running a docker on Ubuntu 18.04.2 LTS. Latest version of home-assistant.

System Health

arch x86_64
dev false
docker true
hassio true
os_name Linux
python_version 3.7.6
timezone Europe/Stockholm
version 0.104.3
virtualenv false

Lovelace

mode storage
resources 0
views 15