When MFA isn't MFA, or how we got phished
Beyond having hardware keys, this scenario is why I really try to drive home, in all of my security trainings, the idea that you should instantly short circuit any situation where you receive a phone call (or other message) and someone starts asking for information. It's always okay to say, "actually, let me get back to you in a minute" and hang up, calling back on a known phone number from the employee directory, or communicate on different channel altogether.Organizationally, everyone should be prepared for and encourage that kind of response as well, such that employees are never scared to say it because they're worried about a snarky/angry/aggressive response.This also applies to non-work related calls: someone from your credit card company is calling and asking for something? Call back on the number on the back of your card.