This FAQ was last modified on: Wednesday, February 10, 2016 09:25am
In order to minimize the risks associated with stolen passwords, your account is required to use a second “factor” (typically a phone or token) whenever your password is used. With Single Sign On (SSO), this can be expected to happen approximately once every 6 hours on each computer and browser you use.
There are five common conditions that can make this seem more frequent or otherwise occur at surprising times. Understanding these might help make these prompts more routine.