Ios home assistant local nsurlerrordomain - 1202 can't connect local!

Hi eveyone! I’m stuck trying to fix a problem with my girl iphone. I use android with local and remote acccess to HAOS. For remote i use duckdns and wireguard but for my girl we decided to allow local only access. The problem is that i get nsurlerrordomain - 1202 as a ssl certificate error from the app and she cannot log in. If a swith the local domain and i set as external url the duckdns it perfeclty works (allowing her to remote log in).
The app works with no problem setting the internal and external url as https://192 xxxxxx:8123 but suddently stop working. As said, we want it to work just local! We tried with safary and it works.

What could I do to fix it?

Could someone help me?

Thanks!