Issue with webhook-based task notifications in Microsoft To Do

Title: Issue with webhook-based task notifications in Microsoft To Do User impact: Users may have been unable to receive webhook-based task notifications in Microsoft To Do. More info: This issue may have affected any webhook-based task notification in Microsoft To Do: - Any webhook notification delivered to your organization's registered notificationUrl endpoints that was setup using Microsoft Graph: https://learn.microsoft.com/en-us/graph/change-notifications-with-resource-data?tabs=csharp - Any automation or workflow that depended on receiving real-time task change callbacks If your organization relied 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 status: We've completed the deployment of the long-term fix to the affected infrastructure, and after a period of monitoring, we've confirmed the functionality of webhook-based task notifications in Microsoft To Do is fully restored. Scope of impact: Your organization was impacted by this event, and this issue may have affected any user within your organization. Impact start time: Saturday, May 30, 2026 at 9:00 AM UTC Impact end time: Friday, June 26, 2026 at 9:00 AM UTC Next steps: - We're reviewing how we conduct configuration changes to prevent similar events from occurring in future. This is the final update for this incident.

Title: Issue with webhook-based task notifications in Microsoft To Do User impact: 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 organization's registered notificationUrl endpoints that was setup using Microsoft Graph: 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 organization 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 Current status: We've validated the fix produces the desired resolution. We've now begun deploying the fix to the affected infrastructure and we're monitoring this process closely to ensure it progresses as expected. Scope of impact: Your organization is impacted by this event, and this issue may affect any user within your organization. Next update by: Monday, June 29, 2026, at 12:00 PM UTC

Title: Issue with webhook-based task notifications in Microsoft To Do User impact: 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 organization's registered notificationUrl endpoints that was setup using Microsoft Graph: 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 organization 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 Current status: We're continuing to internally validate the fix and we'll aim to provide an estimated deployment timeline as soon as it's available. Scope of impact: Your organization is impacted by this event, and this issue may affect any user within your organization. Next update by: Monday, June 22, 2026, at 12:00 PM UTC

Title: Issue with webhook-based task notifications in Microsoft To Do User impact: 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 organization'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 organization 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 Current status: We've completed the development of the long-term fix to restore webhook-based task notifications in Microsoft To Do, and we're now conducting a period of internal testing to ensure the fix produces the expected resolution. Once complete, we'll begin deploying the fix to the affected infrastructure. Scope of impact: Your organization is impacted by this event, and this issue may affect any user within your organization. Next update by: Wednesday, June 17, 2026, at 12:00 PM UTC

Title: Issue with webhook-based task notifications in Microsoft To Do User impact: 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 organization'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 organization 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 Current status: We've identified a configuration issue affecting webhook-based task notifications in Microsoft To Do. We're developing a long-term fix to restore functionality, and we'll provide additional updates as this progresses. Scope of impact: Your organization is impacted by this event, and this issue may affect any user within your organization. Next update by: Wednesday, June 10, 2026, at 12:00 PM UTC