Cannot embed redash dashboard via iframe?

Hello,

I set up a redash dashboard, generated public secret link, but when I try to embed dashboard on my wordpress site, nothing shows up, just an empty page. I have iframe plugin and it works for embedding other sites pages in my wordpress. Any suggestions what could be the problem? This is iframe code I used:

[iframe src=“http://secret link …org_slug=default” width=“1000px” height=“800px” frameborder=“0” scrolling=“yes” align=“right”]

EDIT: Any alternative ways to embed redash dashboard via wordpress editor?