Can't use port 443 in the app

I have the HA app set up to work on the IP address when on the home network. That all works fine.
I have also configured my no-ip domain as the external location. This all works fine in a browser but if I set it as the HA location in the app it appears to save, then when I click back in to the settings the port number has disappeared.
Is there no way to use a different port number for the main HA URL?
I’m trying to use https://mydomain.no-ip.biz:443/

https by default is port 443. Most browsers will remove port 443 from the URL since it’s default. same as if you did http://mydomain.no-ip.bix:80, the default port 80 would be removed. But it is still using port 443.

Ah, good point. I replaced it with http://mydomain.no-ip.biz:443/ and it works fine.
Thanks for the pointer.

Just use

https://mydomain.no-ip.biz/

I tried that, but it doesn’t work. What I used above works fine.