Change tracking uses delta queries to let applications discover newly created, updated, or deleted entities without performing a full read of the target resource with every request.
Update to delta link lifetime
Effective today, delta links for identity and access and education resources have a lifetime of seven (7) days instead of the previous lifetime of thirty (30) days.
If you obtained a delta link from a previous delta request and query Microsoft Graph with this delta link more than seven days after the initial query, you will receive a BadRequest response with the error code “syncStateNotFound” and the following error message: “The sync state generation is not found. The delta token is expired and data must be synchronized again.”
To fix that error, simply start a full synchronization again, and update your code to ensure that your application will query Microsoft Graph before the deadline of seven days.
The following resources are affected by the change of delta link lifetime.
Identity and access resources
- administrative units (preview)
- directory objects (preview)
- directory roles
- organizational contacts
- OAuth2PermissionGrants (preview)