The Azure status page said the issues had begun at 04.39 UTC (3.39pm Monday AEDT).
Woops. pic.twitter.com/d4p1GQoFID— Kevin Beaumont ? (@GossiTheDog) November 19, 2018
Since that time, customers in European, Asia-Pacific and North American regions had problems signing into Azure resources such as Azure Active Directory for which MFA was required as a policy.
There were indications that a hotfix was being readied to be applied, but there was no feedback on whether this had gone ahead or not, though an update was promised within an hour.
At least UK politicians won't be affected by Office 365 Multifactor Authentication being down. pic.twitter.com/lpOo3cSCEz— Carl Gottlieb (@CarlGottlieb) November 19, 2018
A recent update says there will be an indication of where things are at by Tuesday midnight UTC (11am AEDT Wednesday).