I have created a report with Power BI Desktop (October 2017), then I have saved it to a Power BI Server.
I am displaying the report in an iFrame, in an MVC Project, like this:
<div style="height:900px">
<iframe src="http://192.168.0.20/reports/powerbi/util?rs:embed=true" allowFullScreen="true" style="overflow:hidden;height:100%;width:100%"></iframe>
</div>
The report displays correctly on a desktop browser, but when I enter from a mobile (Android or iOS), the report is blank (white).