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Use app-only authentication with Postman for Microsoft Graph

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This article describes how you can use app-only (application) authentication with Postman for Microsoft Graph to run requests without a signed-in user.

Prerequisite

Complete the setup instructions in the Use Postman with the Microsoft Graph API article, before you can continue with this tutorial.

Step 1: Get an application access token

The first time you run a request as an application authentication flow, you need to get an access token:

  1. Select the Application folder.
  2. Select the Authorization tab.
  3. In the Configure New Token section, leave all the fields as preconfigured, including the Grant type that is set to Client Credentials.
  4. Scroll down on the right and select Get New Access Token.
  5. Select Proceed, and then select the Use Token button.

You have now a valid access token to use for application requests.

Step 2: Run your first application request

The Application folder contains many requests for Microsoft Graph workloads that you can consume:

  1. Expand the Application folder, and then expand the User folder.
  2. Double-click Get Users to open the request.
  3. On the top right, select Send.

You have now successfully run a Microsoft Graph request using application authentication.

You can repeat these steps to run other requests to Microsoft Graph. Note that you have to add permissions to your Microsoft Entra application for other requests to work; otherwise, you get permission denied errors in your responses. To find the right permissions, check the Permissions section of the relevant API and look for the application permission type.

Next steps

Now that you have successfully made a Microsoft Graph call using application authentication, proceed to the next article to run your first delegated request.

Contributing to the collection

If you want to contribute your own requests to the Microsoft Graph Postman collection, you need a Postman license. You can make your changes to the forked collection, and then hover over the collection top node and select Create pull request.

Known issues

Authentication fails with "You can't get there from here"

Certain conditional access policies configured by your organization's administrators can block the authentication flow from Postman. To explore alternatives, contact your administrators.

"Access to OData is disabled."

See 403 Forbidden "Access to OData is disabled.".

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