Notify manager upon submission in Google Forms

Code.gs

function onSubmit(e) {
  var formResponse = e.response;
  var respondant = formResponse.getRespondentEmail();
  var user = AdminDirectory.Users.get(respondant);
  var userManager, a;
  
  for (a = 0; a < user.relations.length; a++) {
    if (user.relations[a].type == 'manager') {
      userManager = user.relations[a].value;
    }
  }
  if (userManager) {
    MailApp.sendEmail(
      userManager,
      user.name.fullName + ' submitted Google Form: ' + e.source.getTitle(),
      user.name.fullName + " <" + user.primaryEmail + '> submitted Google Form ' + e.source.getTitle() + ' on ' + new Date().toString(), {
      noReply: true
      });
  }
}