You have seen the announcement in the What's New Guide that the DLP Cloud Service for Email now integrates with the Email Quarantine feature in Email Security.cloud. You've seen documentation about setting up quarantine with on-prem SMG, but would like to know how to do this for DLP Cloud Service.
Release : 15.8
Component : Cloud Service for Email, in Forwarding mode with Email Security.cloud integration
The What's New Guide for DLP states that in 15.8 there is now "Cloud email quarantine and release integration with Email Security.cloud", but does not indicate how to set this up.
Instructions for configuring this feature are in the DLP "Help Center", Configuring the Enforce Server to sync with Email Security.cloud Email Quarantine (broadcom.com)
In order to complete the setup, as given in the link above, the following details are required:
Details on how to create Email Quarantine Administrator accounts are at this Email Security.cloud Help Center page: Defining Quarantine Administrators (broadcom.com)