Microsoft is actively investigating ongoing access issues affecting SharePoint Online, part of the Microsoft 365 suite. Users have reported intermittent errors, including “Something went wrong” messages and HTTP 503 failures when attempting to access SharePoint sites.
The company identified the root cause as a recent change to authentication configurations, which resulted in request URLs exceeding character limits and causing failed requests. Network trace logs also revealed a recurring authentication-related cookie contributing to the errors.
Microsoft has disabled the problematic change for a subset of users and is monitoring the results. A broader rollout of the fix is planned once its effectiveness is confirmed. The issues appear to affect users on specific infrastructure, although Microsoft has not specified the impacted regions.
As a temporary workaround, users may be able to access SharePoint Online using incognito or InPrivate browsing modes. Administrators are advised to monitor the Microsoft 365 Service Health Dashboard for updates. Microsoft’s next scheduled update is expected by July 7, 2025, at 8:30 PM UTC.
Summary Table
| Issue | Description | Status | Workaround |
|---|---|---|---|
| SharePoint Online Access | Errors and HTTP 503 failures due to authentication config changes | Ongoing | Use incognito/InPrivate mode |
| Affected Users | Users on specific infrastructure | Ongoing | |
| Next Microsoft Update | July 7, 2025, 8:30 PM UTC | Pending |
Microsoft continues to work on a resolution and will provide further updates as they become available.
