$Authenticate->storeResult("level", "level");
should be:
$Authenticate->storeResult("level", "MM_UserGroup");
Thank you so much. It worked.
Although I had earlier changed it from <?php if (!isset($_SESSION['MM_UserGroup']) || $_SESSION['MM_UserGroup'] == 'Operator'){ ?> to <?php if (!isset($_SESSION['level']) || $_SESSION['level'] == 'Operator'){ ?> and it worked but I have changed it back to what you suggested and it still worked