Powershell Script & workflow problems. HELP Please!

How do you execute a powershell script on remote host in Opman 12 in workflows.. In 11 I did this and it worked."cmd /c powershell.exe -ExecutionPolicy RemoteSigned .\${FileName}.ps1 ${DeviceName} ${UserName} ${Password} svchost.exe" trying to run a script now fails. with :
" Connecting to remote server failed with the
following error message : The WinRM client cannot process the request. Default
authentication may be used with an IP address under the following conditions: "

This same action on OPMan 11 to same server works. and yes I have updated the Trusted hosts lists on the target server. Does anyone know what I am missing to run Powerhsell scripts in Workflows, I can't find any useful information on how to get started with this on Opman 12
Thanks in advance.