Breaking

Microsoft Confirms Investigation Into Microsoft 365 Copilot Access Outage Tracked as CP1470554

September 12, 2026 at 02:16 EDT

Sales & Business
Security

Microsoft says it is actively investigating a service disruption that is preventing some Microsoft 365 Copilot users from opening the assistant or leaving them stuck with errors, an incident the company has logged internally as CP1470554.

Sept 11, 2026 · Microsoft

Copilot Access Outage: Incident CP1470554

Microsoft is investigating a Microsoft 365 Copilot disruption causing sign-in failures, empty replies, and missing controls across Word, Excel, PowerPoint, Outlook, and Teams.

apps/surfaces affected

100min

prior copilot.microsoft.com outage (Sept 9-10)

root cause details disclosed

Affected Microsoft 365 surfaces

Word

Excel

PowerPoint

Outlook

Teams

Copilot Chat

What admins are told to do

Check the Service Health Dashboard for CP1470554 before troubleshooting endpoints. Clearing cache, reinstalling Office, or rotating passwords will not fix a backend-side outage.

Not a security breach

Microsoft has not linked CP1470554 to any account-takeover or identity compromise alerts.

Recurring pattern

Third Copilot-related disruption since late August, following an auth-config outage and a copilot.microsoft.com outage.

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