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How to Get Microsoft Graph Calendar Change Notifications

Amos Gikunda Oct 1, 2026 869 views

Question details

Developers need to receive near-real-time notifications when calendar events are created, modified, or deleted using the Microsoft Graph API.

Setting Up Microsoft Graph Calendar Change Notifications

Product: Microsoft Graph API
Device & OS: not provided
Scenario: Developing or maintaining an application that requires instant updates from a user's or organization's calendar events.
Observed behavior: Developers are looking for the correct endpoints and official support channels to successfully implement webhooks for calendar event tracking.

Before you start

Ensure you have an active Microsoft 365 Developer account and have registered your application in Microsoft Entra ID with the appropriate calendar permissions.

Solution 1Recommended

Seek Official Support on Microsoft Q&A

Because implementing API webhooks requires specific technical configurations, the official Microsoft Q&A forum is the recommended place to get code-level assistance.

Microsoft Graph has dedicated engineers and a strong developer community actively monitoring the Microsoft Q&A forums. This is the most reliable channel for troubleshooting subscription payloads, endpoint validation, and token issues.

Visit the Microsoft Q&A platform

Open your web browser and navigate to the official Microsoft Q&A website.

Search for Graph topics

Use the search bar to look for the 'Microsoft Graph' tag to see if similar calendar notification questions have already been answered.

Post your specific question

If you cannot find a solution, create a new post detailing your webhook subscription issue, and ensure you apply the 'Microsoft Graph' tag for accurate guidance.

Provide context: When posting, include your application permissions (delegated or application) and any error codes you receive during the subscription creation process.

Solution 2

Implement Graph API Webhook Subscriptions

You can use the Microsoft Graph subscriptions endpoint to manually configure near-real-time notifications.

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Frequently Asked Questions

What are Microsoft Graph change notifications?

Change notifications, also known as webhooks, allow your applications to receive alerts in near-real-time when data—such as calendar events, emails, or contacts—is created, updated, or deleted in Microsoft 365.

Which permissions are required to subscribe to calendar events?

Depending on your app's authentication flow, you will need either delegated or application permissions such as 'Calendars.Read' or 'Calendars.ReadWrite' configured in Microsoft Entra ID.

How long do Microsoft Graph calendar subscriptions last?

Subscriptions for calendar events generally expire after a maximum of 4230 minutes (about 3 days). Your application must monitor the expiration time and renew the subscription before it expires to continue receiving updates.

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