ZyXEL Communications VPN Series Handbook page 761

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Create admin type user on device
Go to Configuration > Object > User/Group > User Click Add button to create an
user and user type is admin. And also entered phone number of this user.
Setup Two-Factor Authentication for admin on your device
Go to Configuration > Object > Auth Method > Two-Factor Authentication >
Admin Access
Enable the function and add admin user which you added in step3 in the rule,
and you can select what services are 2 Factor authentication needed. Enable
SMS function to send verification code by SMS.
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