Adding Calendar API Permission for Microsoft Graph in Azure Portal

1. Go to https://portal.azure.com and log in with your company credentials. 

2. Navigate to App Registrations: Type 'App registrations' on the search bar of the portal and click on the 'App registrations' option. 

3. Find the Graph Application: Click on “All Applications” tab, in the list of registered applications, search for and select the one used in the intranet according to the secrets and credentials. 

4. Open API Permissions: In the left-hand menu of the application page, click on Manage'  >  'API permissions'. 

5. Add a Permission: Click the 'Add a permission' button at the top of the page grid and then in the 'Request API permissions' panel, choose 'Microsoft Graph'. 

6. Select 'Application permissions' and in the permissions search box, type 'Calendars'. Then select the required permission(s), such as: Calendars.Read, Calendars.ReadBasic.All. Click 'Add permissions' to add the selected calendar permissions to the application. 

7. Grant Admin Consent (if required): After adding permissions, click 'Grant admin consent' so the permissions are activated for the organization. 

8. Verify Permissions: Ensure the new calendar permissions appear in the API permissions list and that the status shows 'Granted for <organization>'. 

 

Notes 

If you do not have permission to grant admin consent, contact an Azure administrator to complete that step. Without admin consent, the application may not be able to access calendar data.