Unauthorized Domain Error when using HTML macro for video playlist


I'm using a streaming platform that allows me to upload media and curate videos into a playlist.  When ready to share the playlist, the platform can generate either an iframe or legacy code to embed the playlist into a web page. I am using the HTML macro to embed this on Confluence, however I get an unauthorized domain error message.


The domain needs to be whitelisted for the content to stream through the player.  We use herokuapp.com or, more specifically, for the HTML app we use ac-html-macro.herokuapp.com