UCS wirth OX App Suite syncing CardDav / Caldav does not work on Android

We use OX App Suite (on UCS 5), unfortunately the synchronization of contacts and calendars on Android devices does not work, IOS works fine.
Under the server URL entered in DAVx5, no Carddav/Caldav server is found for the Android device. However, with the same settings it works wonderfully on IOS. IOS automatically sets https://DOMAIN.DE/principals/users/60/ as the account URL in the settings (under Advanced Settings).

What is this URL for Android Dav Syncing Clients?

Best regards
Gunnar