You must be logged in as an Administrator to change this setting!
You can choose if you wish to make two-factor authentication optional or mandatory for users within your organisation. Making it mandatory improves the security of accounts within your system.
If you make it mandatory, the next time the users log in they will be required to configure it before they are able to continue.
Steps
Navigate to the Global settings page.
Scroll down and locate the Security section:
Click on Change alongside the option that dictates the current Two-factor authentication state:
Change the options as you wish.
Click Save to finish.