USERs API does not work after upgrade from 6.4 to 6.6

Document ID : KB000119083
Last Modified Date : 07/11/2018
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Issue:
After upgrading from 6.4 to 6.6 our user rest api's are not working anymore.
Example: 
curl -X GET --header "Accept: application/json" "http://RA_Servername:8080/datamanagement/a/api/v4/users"

When the above points to a 6.6 server it returns: 
HTTP Status 404 - /datamanagement/a/api/v4/users
Environment:
CA Release Automation v6.6
Cause:
User Management has been migrated from Automation Studio (ASAP) to the Release Operations Center (ROC) in version 6.6. As a result there were significant changes made which rendered the v4/users api unusable without backwards compatibility. 
Resolution:
There is a new users api. Please login to the ROC and use either of the following for help:
1. Help -> REST API (Documentation); or
2. Help -> REST API (Swagger)