When given -Role Client, these cmdlets attempt to make use of the IGroupPolicyObject COM interface. IGroupPolicyObject requires that it be called from a Single Thread Apartment. STA is not supported in CoreCLR, so these cmdlets will fail when using the Client role.

This is the underlying cause of issue #2599.

The core folk have an existing issue for support of STA.

Steps to reproduce

Enable-WSManCredSSP -DelegateComputer ServerA.foo.xyz.com -Role Client -Force
or
Disable-WSManCredSSP -Role Client

Expected behavior

Perform the operation without error.

Actual behavior

Throws System.InvalidCastException when trying to cast an object to IGroupPolicyObject.

Environment data

> $PSVersionTable
Name                           Value
----                           -----
PSRemotingProtocolVersion      2.3
GitCommitId                    v6.0.0-alpha.16-49-g97be759cc7bd33abbe220dd87...
PSCompatibleVersions           {1.0, 2.0, 3.0, 4.0...}
PSEdition                      Core
CLRVersion
PSVersion                      6.0.0-alpha
BuildVersion                   3.0.0.0
SerializationVersion           1.1.0.1
WSManStackVersion              3.0