HtmlUnit: WebClient enabled JavaScript, but still got JavaScript load error - htmlunit

Question

Tried to create a test using HTMLUnit for Confluence and had to login. But getting error that 'Javascript load error'. I am quite new to HTMLUnit and have only basic knowledge.
Tried for Chrome, Firefox.
Code:
WebClient webClient = new WebClient(BrowserVersion.FIREFOX_38);
webClient.getOptions().setCssEnabled(true);
webClient.getOptions().setJavaScriptEnabled(true);
webClient.getOptions().setThrowExceptionOnScriptError(false);
HtmlPage page = webClient.getPage("https://<domain>.atlassian.net");
webClient.waitForBackgroundJavaScript(30000);
System.out.println(page.asXml());
Part of the HTML page parsed:
<div id="root">
<noscript>
<div class="scriptLoadError"><div class="container"><h1 class="logo">Atlassian</h1><div class="heading">JavaScript is disabled</div><div class="content"><p>You should enable JavaScript to work with this page.</p></div></div></div>
</noscript>
<div id="javaScriptLoadError" style="display: block;">
<div class="scriptLoadError">
<div class="container">
<h1 class="logo">
Atlassian
</h1>
<div class="heading">
JavaScript load error
</div>
<div class="content">
<p>
We tried to load scripts but something went wrong.
</p>
<p>
Please make sure that your network settings allow you to download scripts from the following domain:
</p>
<p>
<b>
https://aid-frontend.prod.atl-paas.net/atlassian-id/front-end/5.0.392
</b>
</p>
</div>
</div>
</div>
</div>
</div>
<script nonce="OtVvyH6YLHv/RlgULCwPrLjIMu8=">
//<![CDATA[
window.onload=function(){document.getElementById("javaScriptLoadError")&&(document.getElementById("javaScriptLoadError").style.display="block")}
//]]>
When I tried using Selenium, it worked fine from the same system.
It would be of great help if someone could help me.