I can't establish a connection between my Smartphone (Huawei P30) and PowerFlamt Fusion of my Powerglider. What could be the Poroblem?

When I use XCsoar, i can see traffic all around me.

Mobile Data are disabled

WiFi Connectin to Smartohone is established

Skydemon only shows a green status bar, that it is trying to connect to Powerflarm,  but nothing happens.

What is my mistake?