Below steps to do intragetion between DLP Enforce server and Cloud DLP Detector
Steps:
Log on to the Enforce Server as Administrator. Make sure you have installed license of “cloud prevent for email” on enforce server.
Go to System > Servers and Detectors. The Overview page appears.
Click Add Cloud Detector. The Add Cloud Detector screen appears. Click Browse in the Enrollment Bundle File field.
Provide location of enrollmentbundle.zip that you received from Symantec and Enter Detector name then click on Enroll Detector.
The status will show as Connected. The enforce server will deploy polices on cloud server.
The Email administrator need route outbound email from Office 365 to provide DLP hostname.