Depending on your personal security settings, a verification code can be sent to your email address, or as a Telegram notification, or received through two-factor authentication (2FA), or be the same your secret passcode.
By default, a verification code is sent to your email address. If you have not received an email with a verification code, send an email to [email protected]
asking to disable login confirmation. Only emails sent from the email address the account was registered with will be reviewed by the tech support.