Title: Users may be unable to access SharePoint Online sites and receive an authentication error
User impact: Users may have been unable to access SharePoint Online sites and received an authentication error.
Final status: After our period of monitoring, we’ve confirmed that our secondary fix has successfully remediated impact for the remaining subset of users.
Scope of impact: Some users attempting to access SharePoint Online sites may have been impacted.
Start time: Wednesday, February 7, 2024, at 1:00 AM UTC
End time: Monday, February 12, 2024, at 9:49 PM UTC
Root cause: A recent update intended to optimize the code path leveraged for users’ sign-ins introduced a code issue, resulting in impact.
Next steps:
– We’re reviewing our update testing and validation procedures to identify how impact was missed and better prevent similar future occurrences.
This is the final update for the event.
