Thanks for the reply. Figured it out now. Few things were going on.
I’m using the WP plugin learndash it uses the post library to make lessons and topics. I had to go into the pro settings and turn on corerstone for this post type.
Next once I could use conerstone to edit these posts types, I pasted in my youtube iframe code and wasn’t showing up the video. In the firefox console I see there error: Load denied by X-Frame-Options: youtube video url here does not permit framing.
What I did was use the direct youtube link and then inserted into the iframe code. Didn’t realize videos have a direct url and embed url. Once I used the embed url the video showed.
Thanks again,