Shared Youtube video not playing in iFrame

I saw similar topics where recipients of shared videos get a frozen splash screen but the video doesn’t start. I’m having the same problem, but only when the recipient is in an iFrame in another page. Also, when the sender removes the video, the iFrame recipient still sees the Youtube thumbnail. Direct to Jitsi server and mobile work as expected. I reproduced the behavior on as well as my own self-hosted platform. No pertinent errors in the Chrome console to work from. Any ideas?