Account verification error

Hey every one, I am having a problem I don’t know what it is actually but I have set a flight right from Singapore shanghai to London Heathrow and when I woke up I found that it gives me this message (Account verification error…etc) I have ended my flight and closed the app then I restarted the router, after that I am not even able to fly online it stucks at (connecting)
I am using iPad Pro 10.5
DSL connection with 50 MB speed
Any help would be appreciated

Please see this: