Power BI Embedded report does not respond well

No, there shouldn't be anything in the way. It's a simple page that shows company logo and a few links to reports on the left side, and iframe on the right side. When a link on the left is clicked, the iframe loads the report. I was using this sample.

<asp:Content ID="BodyContent" ContentPlaceHolderID="MainContent" runat="server">
<script type="text/javascript">
// Update embed report
function updateEmbedReport() {
// Check if the embed url was selected
var embedUrl = document.getElementById('<%=tb_EmbedURL.ClientID%>').value;
// To load a report do the following:
// 1: Set the url
// 2: Add a onload handler to submit the auth token
var iframe = document.getElementById('iFrameEmbedReport');
iframe.src=embedUrl;
iframe.onload = postActionLoadReport;
}
// Post the auth token to the iFrame. 
function postActionLoadReport() {
// Get the app token.
accessToken = document.getElementById('<%=hidReportAppToken.ClientID%>').value;
// Construct the push message structure
var m = { action: "loadReport", accessToken: accessToken };
message = JSON.stringify(m);
// Push the message.
iframe = document.getElementById('iFrameEmbedReport');
iframe.contentWindow.postMessage(message, "*");
}
</script>

<div style="overflow:hidden; height:100%">
<table width="100%" height="100%" cellspacing="0" cellpadding="0"><tr><td width="300" height="100%" style="background-color:#124C8F" valign="top">
<br />
<div align="center"><img src="images/NMBS-logo.png" width="200" /></div>
<br /><br /><br /><br />
<asp:Panel ID="PanelReports" runat="server" Visible="true">
<table width="100%" cellpadding="4" border="0"><tr><td valign="top">
<asp:PlaceHolder runat="server" ID="ContentReportLinks"></asp:PlaceHolder>
</td></tr></table>
<asp:HiddenField ID="hidReportAppToken" runat="server"></asp:HiddenField>
<input type="hidden" id="tb_EmbedURL" style="width: 1024px;" runat="server" />
</asp:Panel>

</td>
<td>

<iframe ID="iFrameEmbedReport" src="" height="100%" width="100%" frameborder="0" seamless></iframe>
</td></tr></table>
</div>
</asp:Content>