If you are on the Standard plan or higher, you can enable Dual Factor Authentication (DFA) for your account. When enabled, all of your users will be required to register a cell phone on their next log in. Going forward, if a user logs in from a new device or a new location, we will ask them to verify their identity by texting a code to their cell phone that they need to enter as part of the log in process. It helps provide a higher level of security for your users and your documents.
To enable Dual Factor Authentication, you must be an Administrator or Account Manager. Go to the Settings page (click on the profile of a head in the upper right), and choose Security and Integrations. Then, just click on the toggle button for Two Factor Authentication: