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Impacted services
Microsoft 365 suite
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Details
Title: Users may experience issues when accessing m365.cloud.microsoft or portal.office.com
User impact: Users may experience issues when accessing m365.cloud.microsoft or portal.office.com.
More info: Users were redirected to an error page http://m365.cloud.microsoft/error. While we were investigating this issue, users could have navigated to m365.cloud.microsoft/apps or m365.cloud.microsoft/search as a potential solution in the interim.
Final status: We identified a code issue within a recent change that led to impact, and we've subsequently corrected it to provide mitigation. We confirmed via internal testing, diagnostic data, and customer reports that the issue is resolved.
Scope of impact: This issue may have potentially impacted any user attempting to access Office Home Pages. Specifically, users located in Australia, India, Japan, United States, Asia-Pacific, and South America were affected.
Start time: Wednesday, October 29, 2025, 9:30 PM UTC
End time: Thursday, October 30, 2025, at 4:21 AM UTC
Preliminary root cause: A recent code change inadvertently caused issues when users attempted to access m365.cloud.microsoft or portal.office.com.
Next steps:
- We're continuing to investigate why this change was not detected earlier during our deployment processes, which will help our development of guardrails to prevent these issues in the future.
- We’re reviewing our incident response procedures to more expediently address and mitigate similar issues more quickly in the future.
A preliminary post-incident report will be available on the Service Health Dashboard within two business days, followed by a final report to be published five business days after this post's closure.
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