Domain administrators can force 2FA for all users. To do so, enable "Force two-step authentication" on the User Options card of the General domain settings page. Once this setting is enabled, all users will be required to configure a 2FA method the next time they log into webmail.
On the Accounts page, users who have configured 2FA are indicated with an icon in the account field, and the Password Age tab of the Password Requirements page also has a column to indicate which users have 2FA configured.
Domain administrators can also reset a users 2FA configuration. When accessing the user's settings from the Accounts page, go to the Actions (triple dot) menu and select "Reset Two-Step". This will clear the user's current 2FA configuration, allowing them to log in an reconfigure it.
Andrew Barker
Software Developer
SmarterTools Inc.
www.smartertools.com