Embed outlook calendar in community article

I'm trying to embed an outlook calendar in an article but the calendar won't display on the page.

The calendar is public (and empty so far):
https://outlook.office365.com/owa/calendar/d3fc0ea072734e64ae79d59ffd459f99@crownpeak.com/bc464b0a189844a5b0ae87915cd4a39a7583330640127845518/calendar.html

This is the code I'm using.

<div class="lia-message-template-content-zone">
<iframe src="https://outlook.office365.com/owa/calendar/d3fc0ea072734e64ae79d59ffd459f99@crownpeak.com/bc464b0a189844a5b0ae87915cd4a39a7583330640127845518/calendar.html" width="100%" scrolling="no" frameborder="0">
</iframe>
</div>

This is the error I'm seeing when I preview or publish.

The calendar is published publicly. You should all be able to view it via the link above. Not sure why the error says the content is blocked. I'm an admin and have advanced html permissions enabled.

Is using an iframe the wrong approach? Is there a better way to put an outlook calendar in an article?

Thanks.