CategoryInfo: InvalidArgument: (:) [Get-VM], ViServerConnectionException
FullyQualifiedErrorId : Client20_ConnectivityServiceImpl_TryVerifyIsConnected_NotConnected,VMware.VimAutomation
Engineering is still investigating this issue.
In the meantime there is a workaround available:
Instead of using pass through authentication provide username and password directly with the PowerCLI ConnectVIServer command