Microsoft Teams Outage Caused by Expired Security Certificate
Microsoft Teams experiences a nearly three-hour outage after the company fails to renew a critical authentication certificate. The embarrassing oversight prevents users from logging into the communication platform.
Microsoft Teams goes down for nearly three hours after Microsoft forgets to renew a critical security certificate. Users attempting to sign into the service on Monday morning encounter error messages indicating a failure to establish an HTTPS connection to Microsoft’s servers.
Microsoft confirms the Teams outage shortly after 9 AM ET and identifies an expired authentication certificate as the root cause. The company begins rolling out a fix at 11:20 AM ET, successfully restoring service for most affected users by noon.
This oversight proves embarrassing for Microsoft, especially as Teams serves as the company's flagship Office hub and recently stars in its own television commercials. The mistake surprises industry watchers, as Microsoft develops its own monitoring software specifically designed to track and prevent certificate expirations.