c# PowerShell runspace woes

I have the following code, and an issue with it.  Starting with the PowerShell block:

Import-Module RemoteDesktop
$ConnBroker = (Get-RDConnectionBrokerHighAvailability -ConnectionBroker "dm3us050.dm3.wizmoworks.net").ActiveManagementServer
Set-RDSessionHost -SessionHost $server -ConnectionBroker $ConnBroke -NewConnectionAllowed $action

And the following c# code:

        public static void RunPowershellCommand(string scriptPath, string[,] variables = null)
        {
            RunspaceConfiguration runspaceConfiguration = RunspaceConfiguration.Create();
            Runspace runspace = RunspaceFactory.CreateRunspace(runspaceConfiguration);
            runspace.Open();
            RunspaceInvoke scriptInvoker = new RunspaceInvoke(runspace);
            //scriptInvoker.Invoke("Set-ExecutionPolicy Unrestricted");
            
            Pipeline pipeline = runspace.CreatePipeline();

            Command myCommand = new Command(scriptPath, false);

            if (variables[0, 0] != null)
            {
                for (int i = 0; i < variables.GetLength(0); i++)  //Add all the powershell variables we might need in the partner specific.
                {
                    runspace.SessionStateProxy.SetVariable(variables[i, 0], variables[i, 1]);
                }
            }

            pipeline.Commands.Add(myCommand);
            Collection<PSObject> psObjects;
            psObjects = pipeline.Invoke();
            runspace.Close();
        }

The powershell script works independently, but when I run it from the c# runspace I get the following error:

{"The term 'Get-RDConnectionBrokerHighAvailability' is not recognized as the name of a cmdlet, function, script file, or operable program. Check the spelling of the name, or if a path was included, verify that the path is correct and try again."}

Any ideas why Powershell can't use this cmdlet when invoked via my c# app?

Thanks,