Steps:

• Login to portal.azure.com
• Open Azure AD (AAD).
• Click on the left menu on “enterprise application”.
• Search for “Apple business manager” and click on it.
  • On the left side, click on “Provisioning”.
  • Click on “Edit provisioning” button on the top menu
  • Expand “Admin Credentials”
  • Copy the secret token and Tenant URL from the steps in apple business manager section below and paste them in the “Admin Credentials” section.
  • Click on “Test Connection” to make sure the connection is successful.
  • Save the settings.
  • Click on “Restart Provisioning” to make sure the connection is running on the new settings.
• Login to apple business manager portal
  • Go to “Directory Sync” in the preference portal.
  • Click on edit button
  • Click on generate token