Translated by google:
>>How can I get rid of the "Enable iCloud" window that appears every time I open Settings?
Every time I go into Settings, a dialog box pops up asking, "Enable iCloud?" However, iCloud, Messages, and calls are already enabled. How can I stop this from appearing? Clicking the "Enable" button doesn't help.<<
Did you already try to log out of your Apple Account in Settings -> Your Name -> Sign Out, restart your device and log in again?
Also make sure not to use a VPN, so that Apple servers can be contacted by your device.