This adds another level of security to protect your data. Setting Multifactor Authentication will recognise the device you are on. The first time you use a new device a six digit code will be sent to your registered mobile phone number which you will be required to enter before continuing.
To enable MFA (Enhanced Security) log into your My Eurotunnel account and proceed to your Personal Details page. From there you will find the option to enable this extra layer of protection.