Hi gruewwald,
We're here to help with iCloud.
What are you seeing on screen specifically? Is there an error saying the server can't be reached?
This indicates a connection issue. Try reconnecting your device to your Wi-Fi. Restart your device and any Wi-Fi or networking equipment. Turn off any VPN software or configuration you might have.
Here is an article that you can reference to ensure your network is most compliant with your Apple device:
Recommended settings for Wi-Fi routers and access points
If that hasn't solved your concern, let us know which device you're working with so we can help.
Thanks for using the Apple Support Communities.