embedded iframe issue in IE

[arturm]

Hello,

when I use embedded report in iFrame in Internet Explorer 11, user after login is redirected to "app.powerbi.com/report?..." instead of displaying it in embedded iframe on page. Below steps to reproduce:

1. We have embedded iframe in app: 

<iframe width="1140" height="541.25" src="https://app.powerbi.com/reportEmbed?reportId=... />

1. User opens my web app page. Click on sign in button inside iframe.
2. New page opens which sign in user to powerbi.
3. New page ask "The webpage you are viewing is trying to close tab. Do you want to close?"
4. When click yes -> IE closes tab and previous tab (where my app was opened) is redirected to https://app.powerbi.com/reportEmbed?reportId=..." instead of staying on web page and display report in embedded iFrame.

Thank you for your help!