Microsoft 365

Microsoft 365 services experienced a brief outage last week, October 9, 2025, that primarily affected AT&T customers in North America. The disruption was caused by a misconfiguration in AT&T’s network and was resolved by reverting the change, with both Microsoft and AT&T confirming service restoration.

What happened: A misconfiguration on AT&T’s network resulted in a brief disruption to Microsoft 365 services for some users.

Who was affected: AT&T customers in North America, particularly those in the eastern United States.

What was affected: Microsoft 365 services, including Teams, Azure, and others.

What was the cause: The issue was attributed to a misconfiguration on AT&T’s network. Neither AT&T nor Microsoft have provided further details on the exact nature of the misconfiguration.

When was it resolved: The incident started around 1810 UTC on October 9 and was fully resolved by 1848 UTC, shortly after AT&T reverted the change.