Calendar Problems

Fix Only One Calendar Event Attachment Showing via Microsoft Graph API

Tauseeq Magsi Oct 1, 2026 868 views

Question details

A user added multiple attachments to a calendar event using the Microsoft Graph API, but users accessing the shared calendar can only see the first attachment.

Fix Only One Calendar Event Attachment Showing via Microsoft Graph API

Product: Microsoft Graph API
Device & OS: not provided
Scenario: Adding multiple attachments to a shared calendar event programmatically.
Observed behavior: The event owner can view all uploaded attachments, but shared users can only see the first one.

Before you start

Before diagnosing API behaviors, ensure that the shared calendar has fully synchronized and that the user has the appropriate read permissions for the specific event.

Solution 1Recommended

Escalate to Microsoft Q&A for Developer Diagnostics

Because this issue involves API endpoints, payloads, and calendar-sharing mechanics, it requires targeted investigation by Microsoft Graph API developers.

This behavior might be caused by an API limitation, a synchronization bug in shared calendar views, or complex permission inheritance issues. Standard consumer support cannot resolve backend API issues, so gathering developer logs is essential.

Gather API Request Details

Compile the exact request code, the method used to create and upload the attachments, and the raw response data from the server.

Document Permissions and API Version

Note down the specific API version you are using (e.g., v1.0 or beta) and the exact calendar sharing permissions assigned to the affected user.

Post on Microsoft Q&A

Navigate to the Microsoft Q&A platform, select the Microsoft Graph API tags, and post your detailed technical findings so Graph API experts can investigate the synchronization failure.

Escalate to Microsoft Q&A for Developer Diagnostics

API Support Scope: Questions regarding programmatic access and API integration fall outside the scope of general Microsoft Community support.

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Frequently Asked Questions

Why do some attachments fail to appear in shared Microsoft calendars?

Visibility issues often stem from backend synchronization delays, cached data in the local client, or permission mismatch errors where the shared user lacks rights to the specific attachment objects.

Are there attachment limits when using the Microsoft Graph API?

Yes. While you can attach multiple files, the standard attachment endpoint typically limits payload sizes (e.g., 3MB per request). Larger files require an upload session, which might behave differently in shared environments.

How can I verify if the issue is API-specific?

Try removing the programmatically added attachments and adding them manually through the standard Outlook or web calendar interface. If shared users can see all manually added attachments, the issue is isolated to the API payload or method.

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