External users may be unable to access SharePoint Online sites and OneDrive for Business content

Title: External users may be unable to access SharePoint Online sites and OneDrive for Business content

User impact: External users may have been unable to access SharePoint Online sites and OneDrive for Business content.

More info: External users may have been unable to access shared files and content and were receiving error messages such as: “Something went wrong. We’re sorry, sign-in isn’t working right now. But we’re on it! Please try again later.”

Final status: We’ve completed the deployment of the fix to the affected environments on Wednesday, September 13, 2023. Some users may have experienced incremental improvement earlier as the deployment progressed.

Start Time: Monday, June 19, 2023, at 12:00 AM UTC

End Time: Wednesday, September 13, 2023, at 1:00 AM UTC

Scope of impact: This issue may have impacted any external users who were attempting to access shared SharePoint Online sites and OneDrive for Business content.

Root cause: A recent code change resulted in impact, causing external users to receive error messages when attempting to access SharePoint Online sites and OneDrive for Business content.

We will publish a Post-Incident Report for this event within five business days.