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When using any Graph method, it is important to make sure the access token contains the required scopes.
Scopes allow us to have a greater resolution regarding access to resources, for example, to separate between a read/write access or to specify which methods inside the service are allowed. For our needs, this is the minimum which is required: In the Create screen enter the following information: Create new Client Secret For apps that call Microsoft Graph under their own identity, Microsoft Graph exposes application permissions (Microsoft Graph can also expose delegated permissions for apps that call Microsoft Graph on behalf of a user). We will receive a response with a JSON object containing the following properties: This option is called Client Credentials Grant Flow and is suitable for machine-to-machine authentication where a specific user’s permission to access data is not required.

A Redirect URL for your service to receive token responses. Now that we have created an App we have to configure its permissions. It must exactly match one of the redirect URIs that you registered in the portal, except that it must be URL encoded, and it can have additional path segments. In most cases, users should consent themselves. But if we wanted a delegated token (so we can perform operations on behalf of a user) we needed the user credentials. Azure Active Directory Authorization endpoint has the following URL format: https://login.microsoftonline.com/.onmicrosoft.com/oauth2/token. It’s all about regulating access to resources. Use the access token to call Microsoft Graph. With the OAuth 2.0 client credentials grant flow, your app authenticates directly at the Microsoft identity platform /token endpoint using the Application ID assigned by Azure AD and the Application Secret that you create using the portal. As it turns out, in order to use any of the Microsoft Graph API, we need to let it know who we are – who is making the request. They are used to prove for that application that the user contained in the token is authenticated for it. Note: Consenting on behalf of all users is usually only done in specific scenarios, like a background service which requires full access to all tenant data. Note: We recommend that you configure the least privileged set of permissions required by your app.

So how do we get the access token? See the scope parameter description in the token request below for details. But, in many cases, we wouldn't have access to the user password - this flow is more designed for System Accounts, where we have full control of the user.
It is a simple REST API and Microsoft provided many examples on how to use it including an interactive Graph Explorer which allows us to discover the different methods. Access tokens can only be addressed to one audience (resource), which means that in many cases we will need to use several access tokens – each one addressed for a different service.

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