Trouble embedding Rise Course in Wordpress site

I have a Rise course that I'd like to embed in a blog post on my Wordpress site. I added a Code Block (Avada Fusion builder) and entered the following code:

<iframe src="https://hcicontent.com/hci_courses/1330006_Occupational_Therapy/index.html" width="1200" height="600"></iframe>

However, the course does not appear. I tried https and http with the same results. Chrome and Safari display a gray or blank area where the course should be. IE states, "Content was blocked because it was not signed by a valid security certificate. "

The course plays fine when I directly enter the URL into the browser address bar.

The blog post URL is: https://www.homecareinstitute.com/medicare-covered-occupational-therapy-services/

Can anyone tell me what I'm doing wrong?