If you can't connect or sign in to iCloud, read this support article --> If you can't connect or sign in to iCloud - Apple Support
If using cellular data, try using WiFi instead —> Connect to Wi-Fi on your iPhone or iPad - Apple Support
"Verification Failed This Apple ID is not active" --> According to Apple Community Specialist Brittany1416 in thread Inactive Apple ID - Apple Community , please contact Apple Support for help with an "inactive" Apple ID.
"Verification Failed An unknown error occurred. --> In this case My Apple Account got locked for no reason… - Apple Community the account had been permanently disabled. Again, contact Apple to verify if this is the case.
That error message is kind of vague. Try asking Apple. This support page has information about contacting Apple support and service ➔ Contact Apple Support - Apple Support If live support options (chat and/or telephone) are available they will show near the bottom left.
- Telephone numbers may only work when calling from the same country.
- Chat options (telephone numbers appear as active links, not plain text) may depend upon cellular connectivity. If a number shows as an active link, click on it to see additional options.
- If chat is not available on the top level support page, try selecting your hardware and narrow down your issue to see if a support article offers a support link offering chat. For example, the contact support link on this page Check your Apple Account balance - Apple Support offers a chat link about emptying account balance even on a computer where the top level page does not offer any chat.
With an iPhone, iPad, or Vision, you may be able to chat using the Apple Support App if it is available in your country —> https://apps.apple.com/app/apple-support/id1130498044
