Can not connect to Docker CMS on Synology NAS

Hello,

I have installed the CMS within Docker on a Synology NAS. All is set-up on LAN, so IP is e.g. 192.168.100.200 for the Xibo-CMS (pointing to the NAS). I have access to the backend-part of Xibo with 192.168.92.161:8888

When opening a client on an Android device it says “Unable to connect to that CMS Address”
code=404, message=Not Found, url=http//192.168.100.200/xmds.php?what

This is the Docker-part on the Synology:
grafik

This is what the links look like:
grafik

So, do I need a different URL then?

Thanks for helping.
Tobias

Edit: I have entered this URL http://192.168.100.200:8888 to connect to the CMS
Now the LogFile says:
SQLSTATE[HY000]: General error: 1364 Field ‘overrideConfig’ doesn’t have a default value