Your ROOT_URL in app.ini is https://source.parasitstudio.de:63000/ but you are visiting https://source.parasitstudio.de/wirtz/AutoConnect/src/commit/2143b0f2f81df075c507af8bb5a397b9ce801cdb/examples/mqttRSSI_NA
You should set ROOT_URL correctly, otherwise the web may not work correctly.