Captive portal and AP notification


First of all, I would like to say thank you for your awesome project. I’ve installed it, it went straight forward.
I also make projects for ESP32 / ESP8266 and I saw the captive portal solution in your product. I’ve tried to google it, I’ve analyzed your code but I’ve no success. I have my webserver running and after connecting to AP I can reach the (default) website, but I don’t have any Android notification as WLED has .
Could you point to that code part which does the Android notification, or could you tell me some details about that? Which properties need to have the AP to trigger the phone and create a notification such like WLED has?

Thank you for your help!