Microsoft is investigating a new Microsoft 365 outage that is affecting Teams customers and causing call failures.
Since the incident started more than one hour ago, outage monitoring service Downdetector has received hundreds of reports, with affected users saying they’re also experiencing authentication problems.
“Users may not be able to receive calls placed through Microsoft Teams-provisioned auto attendants and call queues,” the company said in a new service alert (TM1022107) in the Microsoft 365 admin center.
“We’re analyzing service telemetry and call metadata to better understand the nature of impact and determine our next steps.”
Microsoft has yet to share what regions are impacted by this ongoing outage and more information on the incident’s root cause.
Despite Redmond saying the incident only affects the Teams communication platform, users report a much broader impact. They’re also experiencing issues connecting to Outlook, OneDrive, and Exchange or checking email messages.
“It affects multiple services, including Teams, Exchange, SharePoint, Bing, and so on. So, it’s bigger than this,” one customer said.
“Can only access outlook and teams via mobile, and only accessing my 365 emails via the outlook app will not load on apples native mail app,” another added.
Over the weekend, Microsoft said it addressed another Microsoft 365 outage that affected Outlook and Exchange Online authentication and caused Teams and Power Platform degraded functionality.
The company linked this weekend’s incident to a coding issue in a recent update to Microsoft 365 authentication systems.
However, a Monday advisory revealed that Exchange Online users still have issues accessing their calendars and email messages using the iOS native mail app.
Last week, Microsoft fixed another issue caused by a DNS change that triggered Entra ID authentication failures for customers using Seamless SSO and Microsoft Entra Connect Sync.
