Custom Script says it executed, but doesn't actually

Custom Script says it executed, but doesn't actually

I'm sending the following command through a Custom Script to one machine

powershell -noprofile Set-ExecutionPolicy RemoteSigned -Force

This command works fine when I run it manually from a command prompt running under the System account on the server.  However, when I push it through the Custom Script option in Desktop Central, it reports that it executed successfully, but the ExcecutionPolicy is not actually changed on the server.  Any ideas what I am doing wrong?
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