Unable to embed YouTube video - Captivate 9

On one slide I have added a Web Object and chose "Embeded Code" and placed this  the slot for the embedded code: <iframe width="560" height="315" src="https://www.youtube.com/embed/oxoUY099Z3o" frameborder="0" allowfullscreen></iframe>

I also selected the "auto load" option.

When I test with F12 it works fine.   When I publish the course, the screen with this slide is white, no video. The slide will run the duration  I set in the timeline then advance to the next slide in the course.   Using this forum I have looked for an answer and I'm stumped.

I am using Captivate 9.0.0.223. As you can see the YouTube video does exist. (https://www.youtube.com/embed/oxoUY099Z3o). I did include the complete web address.

I have also attempted this using the YouTube interaction with similar results.

Any suggestions?