Strange issue - Cloudflare Tunnel - Android App

Hello
I have a strange issue that I am unable to diagnose.
I have published a cloudflare tunnel on port 443 (Https) to homeassistant server back home (CGnattted).

If I access it using the browser, it works well.
If I access it using the app, it seems to ignore the cloudfalre tunnel and try to reach the hassio directly. On the same mobile phone, browser works ok.

External server url is https://xyz.abc.com
Internal url is https://123.xyz.abc.com:8123

Internally - all works good. Externally, using browser, https://xyz.abc.com is good. App is NOT.