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Microsoft 365 Copilot: Login Failed / SSO Error
Current Status: Operational
Last checked: 3m ago
What We're Seeing Right Now
No recent issues reported. If you're experiencing problems with Microsoft 365 Copilot, report below to help the community.
What is this error?
When you can't log into Microsoft 365 Copilot, the authentication system is rejecting your credentials or the SSO/OAuth flow is broken. This blocks access to all AI features.
Error Signatures
Login failedAuthentication errorSSO errorUnable to sign inSession expiredInvalid credentialsOAuth errorAccess deniedCommon Causes
- Microsoft 365 Copilot auth/login servers are down
- SSO provider issue (Google, Microsoft, etc.)
- Password recently changed or expired
- Browser cookies/cache blocking login
- Two-factor authentication issue
✓ How to Fix It
- Try logging in from an incognito/private window
- Clear browser cookies for Microsoft 365 Copilot
- Try a different login method (email vs Google vs SSO)
- Reset your password if needed
- Disable browser extensions that may interfere
- Check this page for widespread login issues
Live Signals
Service Components
M365 Copilot Web
OperationalRecent Incidents
No incidents in the past 30 days
Frequently Asked Questions
Why can't I log into Microsoft 365 Copilot?
Try incognito mode, clear cookies, or use a different login method. If the issue is widespread, check the status above.
Is Microsoft 365 Copilot login down?
Check community reports below for login-related issues.
How do I fix Microsoft 365 Copilot SSO errors?
Try a different SSO provider or use email/password login. Clear cookies and try incognito mode.