This is a very difficult situation from an IT security perspective.  Multi-factor authentication is a necessary step for the security of many systems and applications, especially those that are cloud hosted.  These types of outages can and will shake the confidence of users and make the move to multi-factor authentication that much more difficult to pursue and expand for IT security professionals in organizations.

https://www.infosecurity-magazine.com/news/2fa-login-failure-in-office-365/