I try to log in my account so many time but why always says verification failed cannot connect to thenetwrok

Re: "I try to log in my account so many time but why always says verification failed cannot connect to thenetwrok"

Wondering which iOS version is installed on your iPhone 6 Plus:

The latest iOS version that can be installed is iOS 12.5.7

Apple says: "This update provides important security updates and is recommended for all users".

You. could check if there is an update waiting to be installed: Settings > General > Software update.

or

If already updated to iOS 12.5.7. try restarting your iPhone: Restart your iPhone - Apple Support

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Re: I don’t know what happen but I cannot log in my accnt id

You may want to check you are signed in (to your iPhone) with your correct Apple ID:

Sign in with your Apple ID - Apple Support

If you wish: You can try to log-in to your Apple ID account online. (You can check or edit your details there:)

https://appleid.apple.com

See how to: Get a verification code and sign in with two-factor authentication - Apple Support

or

More info: Two-factor authentication for Apple ID - Apple Support

If needed: Apple ID Support website (info / support / contact options:

Apple ID - Official Apple Support