Microsoft 365 Alert – Service Degradation – Microsoft 365 suite – Users are unable to receive webhook-based task notifications in Microsoft To Do – RESOLVED

Announcements Arpan Das

02/05/2026 09:03:00 AM

NHSmail Reference: INC46841107

Microsoft Reference: MO1331639

Issue Status: RESOLVED

Issue Description: Users are unable to receive webhook-based task notifications in Microsoft To Do.

More info: This issue may affect any webhook-based task notification in Microsoft To Do.

Any webhook notification delivery to your organisation’s registered notificationUrl endpoints that was setup using MSGraph: https://learn.microsoft.com/en-us/graph/change-notifications-with-resource-data?tabs=csharp
– Any automation or workflow that depends on receiving real-time task change callbacks

If your organisation relies on webhook notifications for task automation:
– Consider temporary polling via GET requests to /me/todo/lists/{listId}/tasks as a workaround: https://learn.microsoft.com/en-us/graph/api/resources/todo-overview?view=graph-rest-1.0

Final Update: 30/06/2026 09:36:00 AM – Microsoft has completed the deployment of the long-term fix to the affected infrastructure, and after a period of monitoring, they have confirmed the functionality of webhook-based task notifications in Microsoft To Do is fully restored.

Scope of impact: Your organization is impacted by this event, and this issue may affect any user within your organization.

Next Steps: Microsoft are reviewing how they conduct configuration changes to prevent similar events from occurring in future.