Change the client configuration on VMM server by running: winrm set winrm/config/client/auth @{CredSSP="true"} from elevated ...

Change the client configuration on VMM server by running: winrm set winrm/config/client/auth @{CredSSP="true"} from elevated command line and try the request again. Also, Group Policy must be edited to allow credential delegation to the target computer. Use gpedit.msc and look at the following policy: Computer Configuration -> Administrative Templates -> System -> Credentials Delegation -> Allow Delegating Fresh Credentials.  Verify that it is enabled and configured with an SPN appropriate for the target computer. For example, for a target computer name "myserver.domain.com", the SPN can be one of the following: WSMAN/myserver.domain.com OR WSMAN/*.domain.com OR WSMAN/*