How to Fix?: Access is denied. Check credentials and try again.

Question

I am trying to access /groups/{groupId}/calendar/events,
but I am receiving an error saying "Access is denied. Check credentials and try again."

I have granted the Group.ReadWrite.All permission. How can I fix this issue?

Please lend me your wisdom.

Answer 1

Hi @宮澤 直行

Group calendars do not support application permissions, so you cannot call this endpoint in an application context.

You need to grant the Group.ReadWrite.All delegated permission to the application and grant administrator consent, then use a delegated authentication flow to obtain an access token, such as auth code flow or ROPC flow.

Call this API endpoint:

Hope this helps.

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Answer 2

Hi 宮澤 直行,

Thanks for reaching out. If using client credentials, ensure that the Group.ReadWrite.All is granted to Application Permissions in Azure via the API permissions page for your application. In the client credential flow, there won't be any user authentication, so delegated permissions won't work.

Thanks.