Outage in Microsoft 365
Some users may be unable to receive responses when using Microsoft 365 Copilot Chat
Resolved Minor
August 25, 2026 - Started about 12 hours ago
- Lasted about 4 hours
Incident Report
Summary AI Generated
A faulty service update caused Microsoft 365 Copilot Chat to fail for some users over approximately 3.9 hours, preventing responses to prompts and generating error messages. Users also reported broader accessibility issues, including SharePoint sites being unreachable and files failing to open. Microsoft identified and rolled back the problematic change, with telemetry showing recovery and affected users confirming restoration of service.
Title: Some users may be unable to receive responses when using Microsoft 365 Copilot Chat
User impact: Users may be unable to receive responses when using Copilot Chat.
More info: Affected users may receive error messages stating that a problem has occurred or that Copilot could not respond.
Current status: We've received reports indicating an issue with Copilot Chat where some users may be unable to receive responses to prompts. We're reviewing service monitoring telemetry to isolate the root cause and determine our next troubleshooting steps.
Scope of impact: Your organization is affected by this event, and some users attempting to use Copilot Chat may be impacted. This information may be updated as our investigation continues.
Next update by: Tuesday, August 25, 2026, at 10:30 AM UTC
User impact: Users may be unable to receive responses when using Copilot Chat.
More info: Affected users may receive error messages stating that a problem has occurred or that Copilot could not respond.
Current status: We've received reports indicating an issue with Copilot Chat where some users may be unable to receive responses to prompts. We're reviewing service monitoring telemetry to isolate the root cause and determine our next troubleshooting steps.
Scope of impact: Your organization is affected by this event, and some users attempting to use Copilot Chat may be impacted. This information may be updated as our investigation continues.
Next update by: Tuesday, August 25, 2026, at 10:30 AM UTC
Trusted by 1,000+ teams
The Status Page Aggregator with Early Outage Detection
Stop finding out about outages from your users. Monitor 6,320+ cloud services and get alerted the second something breaks.
Latest Updates ( sorted recent to last )
about 9 hours ago - at 08/25/2026 10:47AM
The roll back of the suspected change is continuing as expected. Early indications continue to show an improvement in service availability and we've received some reports from previously affected customers that the issue is resolved. We're continuing to monitor this rollback process closely to ensure a complete resolution is achieved.
Next update by: Tuesday, August 25, 2026, at 12:30 PM UTC
This quick update is designed to give the latest information on this issue.
about 10 hours ago - at 08/25/2026 10:25AM
Title: Some users may be unable to receive responses when using Microsoft 365 Copilot Chat
User impact: Users may be unable to receive responses when using Copilot Chat.
More info: Affected users may receive error messages stating that a problem has occurred or that Copilot could not respond.
Current status: We've reverted the suspected change and are observing signs of recovery in service telemetry. We're engaging a sample of affected users to validate whether this action has successfully mitigated the issue and restored Chat functionality.
Scope of impact: This issue may impact any user attempting to use Copilot Chat. This information may be updated as our investigation continues.
Next update by: Tuesday, August 25, 2026, at 12:30 PM UTC
about 10 hours ago - at 08/25/2026 10:08AM
Title: Some users may be unable to receive responses when using Microsoft 365 Copilot Chat
User impact: Users may be unable to receive responses when using Copilot Chat.
More info: Affected users may receive error messages stating that a problem has occurred or that Copilot could not respond.
Current status: We've identified a recent service update that may be contributing to impact. We're continuing to analyze service telemetry and diagnostic data to validate this correlation while evaluating mitigation actions to reduce impact and restore Chat functionality.
Scope of impact: This issue may impact any user attempting to use Copilot Chat. This information may be updated as our investigation continues.
Next update by: Tuesday, August 25, 2026, at 12:00 PM UTC
about 12 hours ago - at 08/25/2026 08:19AM
Title: Some users may be unable to receive responses when using Microsoft 365 Copilot Chat
User impact: Users may be unable to receive responses when using Copilot Chat.
More info: Affected users may receive error messages stating that a problem has occurred or that Copilot could not respond.
Current status: We've received reports indicating an issue with Copilot Chat where some users may be unable to receive responses to prompts. We're reviewing service monitoring telemetry to isolate the root cause and determine our next troubleshooting steps.
Scope of impact: Your organization is affected by this event, and some users attempting to use Copilot Chat may be impacted. This information may be updated as our investigation continues.
Next update by: Tuesday, August 25, 2026, at 10:30 AM UTC
Latest Microsoft 365 outages
The Status Page Aggregator with Early Outage Detection
With IsDown, you can monitor all your critical services' official status pages from one centralized dashboard and receive instant alerts the moment an outage is detected. Say goodbye to constantly checking multiple sites for updates and stay ahead of outages with IsDown.
Start free trialNo credit card required · Cancel anytime · 6320 services available
Integrations with
