Microsoft (translated) outage message:

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Warning Multi-Factor Authentication - Investigating

SUMMARY OF IMPACT: Starting at 14:25 UTC on 27 Nov 2018, customers using Multi-Factor Authentication (MFA)
may experience intermittent issues signing into Azure resources, such as Azure Active Directory, when MFA
is required by policy. Impacted customers may encounter timeout errors.

CURRENT STATUS: Engineers continue to restart backend services responsible for processing Multi-Factor Authentication.
Initial investigation indicates that some MFA authentication requests are completing successfully and some customers may
be seeing signs of recover. In other cases, service restarts appear to provide only temporary relief, so engineers
continue to explore alternate remediation options.

NEXT UPDATE: The next update will be provided by 19:30 UTC.
Status history

We have an outage.  We tried rebooting it, but it may or may not work for you.