The Symantec Workflow Server service is running on the Notification Server. You may question if you need this service since you do not use ServiceDesk or the separate WorkFlow Solution.
Release: 8.1, 8.5, and 8.6
This is by design.
The installation of the Symantec Management Platform includes the installation of Workflow Solution. As portions of Management Platform use functionality provided by Workflow Solution and the Symantec Workflow service removal of the solution or service will cause issues with the Management Platform.