June 16, 2021

Microsoft Teams has been down this morning

Microsoft Teams, the collaboration platform that competes with Slack, has been down since about 8:30 am ET. Microsoft reports the outage was due to an expired certificate.

Microsoft first posted on its Office 365 Status Twitter feed about 9:00 am ET that an outage was in progress, stating the company was looking
We’re investigating an issue where users may be unable to access Microsoft Teams. We’re reviewing systems data to determine the cause of the issue. More information can be found in the Admin center under TM202916

At approximately 10:00 am ET, the company posted the reason for the problem, an expired certificate, which frankly, has to be pretty embarrassing for the group responsible for keeping the Teams service running.

We’ve determined that an authentication certificate has expired causing, users to have issues using the service. We’re developing a fix to apply a new certificate to the service which will remediate impact. Further updates can be found under TM202916 in the admin center.
The company updated the status again, indicating it had begun deploying the updated certificate.

We’ve determined that an authentication certificate has expired causing, users to have issues using the service. We’re developing a fix to apply a new certificate to the service which will remediate impact. Further updates can be found under TM202916 in the admin center.

We’ve initiated the deployment of the updated certificate and are monitoring service health as the fix progresses. Additional information can be found under TM202916 in the admin center.

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