Webviewer is not working

Hi, I'm currently trying to create a website as an app. I have specified all the settings correctly. When I then install the APK on my phone, the "website" doesn't work at all. No button responds, nothing is loaded. What could be the reason? Thanks in advance and greetings

:question:

Did you test with the companion app ?

What is the url for your "website" ?

Show your relevant blocks....