Update src/powershell/public/Clear-ZtRequiredModule.ps1

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: gaelcolas

src/powershell/public/Clear-ZtRequiredModule.ps1

@@ -16,8 +16,10 @@ function Clear-ZtRequiredModule {
         Write-Warning -Message 'This command cannot be run when the module is loaded.'
         Write-Warning -Message 'Please close all sessions where ZeroTrustAssessment module is loaded, then run the following...'
         Write-Warning -Message ('&''{0}''' -f $PSCommandPath)
-        Set-Clipboard -Value ('&''{0}''' -f $PSCommandPath)
-        Write-Warning -Message ('(The command has been copied to your clipboard.)')
+        if ($isWindows -and (Get-Command -Name Set-Clipboard -ErrorAction SilentlyContinue)) {
+            Set-Clipboard -Value ('&''{0}''' -f $PSCommandPath)
+            Write-Warning -Message '(The command has been copied to your clipboard.)'
+        }
         return
     }
     else