Summary:
I’m trying to fetch group calendar and its events using Azure application-only permissions, but I’m getting an error.

Error Message:
Error Message Image

Code:

var graphClient = new GraphServiceClient(authProvider); var events = await graphClient .Groups[groupId] .Calendar .Events .Request() .GetAsync();

• Ensured the application has the required permissions (Calendars.Read, Calendars.ReadWrite,
  Group.ReadWrite.All) in the Azure portal.
• Verified the client credentials (client ID, tenant ID, client secret) are correct.
• Checked that the application is granted admin consent for the required permissions.

Question:
What could be causing the ErrorAccessDenied when trying to fetch the group calendar events with application-only permissions? How can I resolve this issue?

Additional Information:

• The application is registered in Azure AD and has been granted admin consent for the necessary permissions.
• I’m using the Microsoft Graph SDK for .NET.
• The application works correctly for other API calls (e.g., fetching user details).

Any help or pointers would be appreciated!