Registering Application in Microsoft Identity Platform

To register an application in Microsoft Identity platform, do the following:

1. Sign in to the Microsoft Entra admin center using an account that you want to use for sending emails. The account must have an active subscription.
2. Register an application. To do this, go to Entra ID > App registrations, and then click New registration. For more information on registering applications, see this Microsoft article.
3. In the Manage section, select API permissions and grant the application the Mail.Send permission of the Application type for Microsoft Graph.
4. Click Grant admin consent for <tenant_name> and confirm the operation.
5. In the Manage section, select Authentication.
6. On the Redirect URI configuration tab, click Add Redirect URI.
7. In the Select a platform to add redirect URI pane, select Mobile and desktop applications, specify http://localhost as a redirect URI, and then click Configure. For more information, see this Microsoft article.
8. On the Overview page, record the following data required for acquiring an access token:

• Directory (tenant) ID
• Application (client) ID