How do I synchronize contacts with multiple Microsoft users (via app registration)?

Preface

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

Customer-side requirements

• An "App Registration" must be created once via the Azure Active Directory Admin Center.

Instructions: Creating the app registration

1. Click "New Registration" in theAzure Portal:

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

3. Note the Client IDand Tenant ID:

4. Click "Add a certificate or secret" and create a client secret:

5a. Add the required API permissions "Contacts.Read" and "Contacts.ReadWrite" (application permissions) added:

5b. (optional) To use the target "Microsoft 365 - Exchange Online (Personal Contacts) [Multiple users via app registration and group] [BETA]" , the API permissions (Application permissions) "User.Read.All" and "Group.Read.All" required.

6. Grant administrator consent: