Running powershell commands from c# not recognizing the command?

Question

I have this snippet of code:

        PowerShell ps = PowerShell.Create();
        var ipAddress = target_ip.Text;
        var padName = pad_name.Text;

        txtLogs.AppendText($"Initializing bootstrapping process for {padName}");
        ps.AddCommand($"knife bootstrap windows winrm.......

This command works find when typing it in normally in the powershell window. When I do this via C#, it says the command isn't recognized. What else do I need to do?