Got into the office this morning and immediately started the scramble because of reports from several users that Microsoft Office365 TEAMS was not working (a key communication app for us and many other businesses).

Microsoft officially had no outages reported when I looked ~8:50 AM EST. So I think this is very fresh. Teams is currently only working on mobile devices for us. If you look at DownDetector.com (here: https://downdetector.com/status/teams/) the chart is telling. 0 reports of issues until around 8:20 AM they start trickling in, 7k+ reported issues by 9:30 AM.

Looks like Microsoft isn’t having a great start to the week. Back to phone calls and emails for now… If you can swing TEAMS on your mobile device though, thankfully that still works.

Side note, the WEB Application is unfortunately ALSO not working in our testing.

Confirmed from another news source… Microsoft IS having issues this morning:
https://www.onmsft.com/news/microsoft-teams-is-down-this-morning-the-company-is-investigating

Microsoft’s Twitter Feed for Office365 status can be seen here:
https://twitter.com/msft365status

If you have access to your office365 Admin portal, you can also see active issues here:
https://portal.office.com/adminportal/home#/servicehealth

Currently they show a TEAMS Service Degradation – “Can’t access Microsoft Teams” – reported/logged at 9:11 AM EST… the issue actually started around 8:20 AM EST based on reports in Down Detector.

Here is the explanation for the issue per what O365 Admins can see:

Current status: We’ve determined that an authentication certificate has expired causing users who have logged out and those that are still logged in to have issue using the service. We’re developing a fix to apply a new authentication certificate to the service which will remediate impact.

Scope of impact: This issue may potentially affect any of your users attempting to access Microsoft Teams.”


Auth certificate expiration… seriously 🙁

UPDATE/Correction:

The actual ticket states that the issue started at 8:15 AM EST. The ticket was LOGGED around 9:11 AM EST.

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