A "Verification Failed" messages is used in various scenarios which could be either a communication issue, or a problem with your account.
'If you can't connect or sign in to iCloud' click here --> https://support.apple.com/HT203512
"If you can't connect to the App Store, iTunes Store, or other Apple services" click here --> https://support.apple.com/HT201400
- If none of the suggestions work, try the last one: "If you’ve tried all of the above steps and you still can’t connect, contact Apple Support."
Verification Failed "problem connecting to the server" March 2018 - https://discussions.apple.com/thread/8321958 - Needed to connect over wi-fi and not through cellular.
And the opposite:
"Verification Failed, An unknown error occurred" March 2018 - https://discussions.apple.com/message/33184357#message33184357 - "tried again with Wifi off and it worked"
If those don't resolve the problem, I suggest you contact Apple:
Contact Apple. Click here --> https://support.apple.com/choose-country-region Select your country, then a product. If you don't see one that handles your issue then keep experimenting with selections until you reach one that gets you a chat session or a telephone call and get the representative to redirect you.
or:
Contact Apple for support and service --> "See a list of Apple phone numbers around the world."
Click here --> https://support.apple.com/HT201232