Please note: This KB is for customers using DLP Cloud Service for Email in Forwarding mode.
Customers in Reflecting mode (O365 => DLP => O365) should see this topic: About updating email domains in the Enforce Server administration console (broadcom.com).
You are not able to send email through the DLP Cloud Service for Email, and messages are not being delivered from any new domains registered.
These new domains were added via the Email Security.cloud (ESS) ClientNet portal.
Yet messages are not being accepted for delivery, and no DLP Content Inspection is being performed.
Moreover, the Enforce UI is not showing the domains in question, in the Cloud Service for Email detector page.
Cloud Service for Email for customers in "forwarding mode", with Email Security.cloud as downstream MTA.
All supported versions of DLP for integration with the Cloud Service for Email (Enforce 15.8+ AND Cloud Managed DLP in CloudSOC).
As noted above, when the Cloud Email Service is set in Forwarding mode (messages going to Email Security.cloud), any new domains need to be registered via the ClientNet portal - see KB link below for Additional Information.
There is one known issue when the above process can fail:
For the issue described, you should open a ticket with DLP Technical Support.
The support team will inform DLP Cloud Operations, who will investigate the reason for the domain update failure.