Raspberry Pi Installation Help?

[Nachteule]

@plugh
I suspect that simply Kodi is not started, why? - no idea. Of course Kodi should start immediately on a freshly installed system
Try running sudo start xbmc or kodi start in a ssh connection to see if Kodi at least starts manually.
You can find the Kodi log in folder /home/xbian/.kodi/temp/

About the Pi Zero 2W: Why do you always buy such garbage just to save some money and get into a lot of trouble. With 512MB memory for example you really won't be happy with a current Kodi, so don't bother.