WS-MAN (Web Services for Management) is the protocol that the DRAC card uses to communicate. The DRAC card sits on your Dell server and contains the DRAC functionality. It lets you boot to a network ISO and handles features such as power control, temperature control, remote management, and others. The DRAC runs independently of the server; it can be on while the system is off. You can communicate with the DRAC through its own Ethernet jack.
You can use the First Time Setup page to create the WS-MAN credentials that you want to use with the tasks that require authentication.
The credentials that you create are added to the DRAC. You can log on to the DRAC later and complete all of your tasks that require authentication. These tasks include booting to a network ISO and provisioning your servers.
See if core documentation talks about enabling the WSMan task handler policy -?