<li class="k-item js-first-level k-state-default k-state-border-down" role="menuitem" style="z-index: 100;">
  <span class="k-link js-first-level k-state-active k-state-border-down" target="">Reports/Analytics<span class="k-icon k-i-arrow-s"></span></span>
  <div class="k-animation-container" style="width: 152px; height: 145px; margin-left: -2px; padding-left: 2px; padding-right: 2px; padding-bottom: 4px; overflow: visible; display: block; position: absolute; z-index: 10002; top: 27px; left: -2.703125px;">
    <ul class="k-group k-menu-group k-popup k-reset k-state-border-up" role="menu" data-role="popup"
    style="max-height: 578px; overflow: auto; display: block; font-size: 12px; font-family: &#39;Open Sans&#39;, sans-serif; font-stretch: normal; font-style: normal; font-weight: normal; line-height: normal; position: absolute; -webkit-transform: translateY(0px);">
      <li class="k-item js-second-level k-state-default k-first" role="menuitem">
        <a class="k-link js-second-level" href="..." target="">Reports / Analytics</a>
      </li>
      <li class="k-item js-second-level k-state-default" role="menuitem">
        <a class="k-link js-second-level" href="..." target="">User Requested</a>
      </li>

//*[@id="menu"]/li[10]/div/ul/li[2]/a

echo "Switching to mainFramen";
  $driver->switchTo()->frame("mainFrame");
  echo "Finding link Reports/Analyticsn";
  //$input = $driver->findElement(WebDriverBy::partialLinkText('Reports/Analytics')); #didn't work
  $input = $driver->findElement(WebDriverBy::xpath('//*[@id="menu"]/li[10]/span'));
  $input->click();
  echo "Finding link User Requestedn";
  // $input = $driver->findElement(WebDriverBy::partialLinkText('User Requested')); # didn't work
  $input = $driver->findElement(WebDriverBy::xpath('//*[@id="menu"]/li[10]/div/ul/li[2]/a'));
  $input->click();

Switching to mainFrame
Finding link Reports/Analytics
Finding link User Requested
PHP Fatal error:  Uncaught exception 'NoSuchElementException' with message 'no such element