issue on Apple ID verification

Apple offers an improved security method called two-factor authentication that’s designed to ensure that you’re the only person who can access your account, even if someone else knows your password. When you enter your Apple ID and password for the first time on a new device, we’ll ask you to verify your identity with a six-digit verification code. This code is displayed automatically on your other devices, or sent to a phone number you trust. Just enter the code to sign in and access your account on the new device. Never share your password or verification code with anyone else.

https://support.apple.com/en-us/HT201303