You are attempting to register your DLP Cloud Detection Service (aka "CDS", or "Cloud Detector"), and receive the following error when uploading the token required: "either host or url field is required".
DLP Cloud Detection Service (aka "CDS")
Symantec CloudSOC (aka "CASB")
In this case, it is likely the Detector has an incomplete profile and cannot be registered with the CloudSOC.
Verify that the Cloud Detector has fully completed its profile, by following the guidance in this article:
There are a few token-specific errors which indicate an expired token, use of an incorrect token, or an incomplete profile on the DLP Cloud Detector (which also prevents registration in CASB for a new DLP Detector).
Here is a landing page for other errors which can occur when attempting to register a DLP Detector with CASB: