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

宮澤 直行 20 Reputation points

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.

Microsoft Graph
Microsoft Graph
A Microsoft programmability model that exposes REST APIs and client libraries to access data on Microsoft 365 services.
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  1. CarlZhao-MSFT 40,141 Reputation points

    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.

    User's image

    Call this API endpoint:

    User's image

    Hope this helps.

    If the reply is helpful, please click Accept Answer and kindly upvote it. If you have additional questions about this answer, please click Comment.

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  1. TH-4749-MSFT 3,295 Reputation points

    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.


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