If it is a facebook-group it cannot be viewed in the object. Not even if you skip the object and try using an iframe.

Or - maybe the video is "marked" for not being able to be embedded.

Take a look here: https://developers.facebook.com/community/threads/252548632543704/

If/when you have your problem solved, then please post here how it was solved.

Hello. I sent a notification about your question to the company employees, expect an answer from them here in the comments.