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Multi-Factor Authentication (MFA) is a security measure that will prompt you for two forms of verification when accessing a secure account online. You will already have set up your LJMU password to access your IT resources, MFA will prompt for an additional step to enhance the security of your account. You may already use something similar for internet banking where you are prompted for finger print or facial recognition to access your account.
For further information, FAQs and how to set up MFA please see this link.