Your ROOT_URL in app.ini is https://source.parasitstudio.de:63000/ but you are visiting https://source.parasitstudio.de/wirtz/AutoConnect/src/commit/abd1261c3039bc5b135ed2a4038ffd1a0fb3da8c/examples/mqttRSSI_NA
You should set ROOT_URL correctly, otherwise the web may not work correctly.