How do I synchronize the contacts in the Microsoft 365 Global Address List (via app registration)?

Foreword

An alternative to authentication via OAuth is authentication via app registration. With this method, the necessary permissions are managed and granted directly in the Microsoft tenant via an app registration.

Customer-side requirements

• An "App Registration" must be created once via the Microsoft 365 Entra Admin Center

Instructions: Creating the app registration

1. Click on "New Registration" in the Azure Portal:

2. Select the following settings when creating the app registration:

3. Note the Client ID andTenant ID:

4.Click on "Add a certificate or secret" and create a Client Secret:

5a. Add the required API permissions "User.Read.All" (Application permissions):

5b. (optional) To use the "Group selection" the API permissions (application permissions) "Group.Read.All" are also required:

6. Grant administrator consent: