1604 - Microsoft OneNote API authentication changes and impact

Since 31 March 2025, Graph API changes rolled out by Microsoft as part of their Secure Future Initiative have affected Redstor’s ability to backup and restore OneNote Class Notebooks.

Additionally, subsequent changes rolled out by Microsoft to the Graph API have been impacting OneNote standard notebooks since 1 May. These changes have affected all backup vendors using the Graph APIs for OneNote files.

We have made several improvements in order to mitigate these issues, and work now continues to improve the support for OneNote documents within our Microsoft 365 product set.

See a summary of our status quo and upcoming changes below. 

Teams (OneNote Class Notebooks)

• Currently 

  • Backup: Class Notebooks are being backed up as a folder with standard notebooks.

  • Restore: Native restore fails. InstantData can be used to access data as a folder with standard notebooks.

• Next release (expected 23 May)

  • Restore: Restore will exclude Class Notebooks from restores. Restore status recorded as completed with warnings. Class Notebooks can be accessed/recovered via InstantData as a folder with standard notebooks.

• Further proposed changes  

  • Restore: Restore will exclude Class Notebooks from restore. Restore status recorded as successful. Class Notebooks can be accessed/recovered via InstantData as a folder with standard notebooks.

OneDrive (OneNote Class Notebooks)

• Currently

  • Backup: Class Notebooks that were backed up before Microsoft's changes will continue to be backed up/updated. New Class Notebooks will be backed up as a folder with standard notebooks.

  • Restore: Restore is successful. Restore status recorded as completed with warnings. Class Notebooks restored as a folder with standard notebooks.

• Further proposed changes  

  • Restore: Restore status recorded as successful. Class Notebooks restored as a folder with standard notebooks.

OneDrive (OneNote notebooks) and Teams (OneNote notebooks)

• Currently

  • Backup: Notebooks that were backed up before Microsoft's changes will continue to be backed up/updated. New notebooks are not being backed up (backups failing).

  • Restore: Restores are successful. Restore status recorded as completed with warnings.

• Next release (expected 23rd May)

  • Backup: All notebooks will backup. Backup status recorded as completed with warnings.

• Further proposed changes  

  • Backup: Backup status recorded as successful.

Teams (Teams channel messages)

• Currently 

  • Restore: Teams channel messages OneNote file not being generated. Teams channel message data can be accessed/recovered via InstantData as a folder with JSON files.

• Further proposed changes  

  • Restore: Teams channel messages generated in another format.