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If you have lost your 2-Step Authentication details you will need to contact our support team (see support.zettagrid.com). We can disable 2-Step Authentication for your account so you can log in and, if desired, configure 2-Step Authentication again.
If you know your 2-Step Authentication details and want to disable or change the secret key then go to My Profile in MyAccount and select the Security tab. This tab has options for disabling 2-Step Authentication.