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How to Fix Microsoft Graph /me Endpoint Delegated Authentication Error

Maira Mehtab Sep 27, 2026 869 views

Question details

The user is attempting to call the Microsoft Graph /me endpoint from an automated background process but is encountering an authentication error.

Product: Microsoft Graph / Azure Functions
Device & OS: not provided
Scenario: Accessing a user's drive data (graphClient.Me.Drive) inside an Azure Function triggered by a timer, using an app-only client secret for authentication.
Observed behavior: The API request fails because the /me endpoint requires delegated authentication (a signed-in user context), which is incompatible with app-only client-credential flows.

Before you start

Ensure you have administrator access to your Microsoft Entra ID (formerly Azure AD) portal to modify application permissions and grant admin consent.

Solution 1Recommended

Switch to Application Permissions and Specify the User

Since background tasks like timer-triggered Azure Functions lack a signed-in user context, you must bypass the /me endpoint and explicitly target the user using Application Permissions.

The /me endpoint acts as a shortcut that resolves to the currently authenticated user in a delegated flow. In an app-only context, there is no user token present, making the /me endpoint invalid. You need to use the /users/{id} endpoint instead.

Configure Application Permissions

Log into the Azure Portal, go to 'Microsoft Entra ID', and select your App Registration. Navigate to 'API permissions', click 'Add a permission', choose 'Microsoft Graph', and select 'Application permissions' (not Delegated). Add the required permissions such as 'Files.Read.All'.

Grant Admin Consent

After adding the permissions, click the 'Grant admin consent for [Your Tenant]' button to authorize the application to access data without a user present.

Update the Graph SDK Code

Modify your Azure Function code to target a specific user explicitly. Replace the failing 'graphClient.Me.Drive' call with 'graphClient.Users["{user-principal-name-or-id}"].Drive'.

Security Consideration: Application permissions grant the app access to all users' data in the organization by default. Always adhere to the principle of least privilege when selecting scopes.

Solution 2

Consult the Microsoft Q&A Community

If you are unsure which specific permissions or authentication flow best suits your Azure architecture, post your scenario in the official Microsoft forums.

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Frequently Asked Questions

Why do I get a 'token does not contain a valid user' error?

This error occurs because the /me endpoint requires a delegated access token (which contains user claims). If you use an app-only client credential flow, the token only identifies the application, not a user, causing the request to fail.

Can I use delegated authentication in a timer-triggered Azure Function?

Generally, no. Timer triggers run as unattended background processes. Because there is no user interface to prompt someone to sign in interactively, you cannot easily acquire a delegated token. Application permissions are designed specifically for this scenario.

How do I access a specific user's OneDrive files using an app-only token?

You must assign 'Files.Read.All' or 'Files.ReadWrite.All' Application Permissions to your App Registration, obtain admin consent, and then construct your Graph API request to target the specific user via the /users/{id-or-upn}/drive endpoint.

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