Users may not be able to access Class Notebooks in Microsoft OneNote

Title: Users may not be able to access Class Notebooks in Microsoft OneNote User impact: Users may have not been able to access Class Notebooks in Microsoft OneNote. More info: The Class Notebook tab was missing in OneNote making it inaccessible. Final status: We identified an issue contained in a recent service change that was resulting in impact. We reverted this change and were able to confirm that this successfully resolved the event through monitoring service health data. Scope of impact: This event may have impacted any user attempting to utilize the Class Notebooks toolbar in Microsoft OneNote Start time: Thursday, November 5, 2026, at 6:10 PM UTC End time: Thursday, November 5, 2026, at 11:50 PM UTC Root cause: An issue contained in a recent service change that was resulting in impact. Next steps: - We're reviewing the responsible service change to better understand what led to the error that resulted in impact and prevent similar future occurrences. This is the final update for the event.

Title: Users may not be able to access Class Notebooks in Microsoft OneNote User impact: Users may have not been able to access Class Notebooks in Microsoft OneNote. More info: The Class Notebook tab was missing in OneNote making it inaccessible. Current status: We've investigated a problem with accessing Class Notebook in OneNote and confirmed that service is now restored. We'll provide additional information in a closure summary within the "History" section of the "Service health" dashboard shortly.