Microsoft reveals terrible trio of bugs that knocked out Azure, Office 362.5 multi-factor auth logins for 14 hours

Breakdown in MFA's cache, response, and event handling all contributed to TITSUP

Microsoft has delivered its postmortem report detailing the failures that led to unlucky folks being unable to log into its cloud services for 14 hours last week.…

via The Register - Data Centre: Cloud
http://go.theregister.com/feed/www.theregister.co.uk/2018/11/27/microsoft_azure_outage_postmortem/