Andoid APP can't connect from lokal WLAN

Good Morning.
I’m using duckdns for external communication.
Alexa und Cloud and some other Integrations are normal running.

My Settings in hassio are:
external: https://url.duckdns.org/
internal: https://192.168.xxx.xxx:8123/

My Firewall Rules are NAT TCP * 443 → hassio:8123
NAT TCP * 8123 → hassio:8123

All are running, but the Android App can’t connect to my hassio Server from the lokal WLAN.
There are my Settings are:
Home Assistant-URL: https://url.duckdns.org
WLAN SSID: xxx
Internal URL: https://192.168.xxx.xxx:8123

I can open my Browser from my lokal WLAN and can open the Website.
From the App i can only connect to hassio with WLAN offline

Any idears?

My configuration is:

external: https://url.duckdns.org/
internal: http://192.168.xxx.xxx:8123/

https for external and http (not https) for internal…

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on app or hassio or both?

That was going to be my first ask. Is SSL actually active on the internal port? You said you could ‘hit it from a browser on the internal address’ was that with SSL or no?

internal/external is ssl only.
internal http doesen’t work

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I gave my configuration in the configuration.yaml file…

I am using duckdns and NGINX. I have two HA instances on two different sites: it is working fine on one site but not on the other one (I cannot access HA using the https://url.duckdns.org/ or the android app when I am on the LAN on the second site)… Based on what I searched on the net, this is a NAT issue but did not investigate more than that as when on the LAN on the second site, I use my PC to access HA via the internal URL (http)…

So when you are on the lan and you type the external link in a web browser (https://url.duckdns.org/), do you access HA ?