Try this. Go to the actual page on rumble that has the video you want to 'embed'. Now just grab the http address from the top of the bar and add that as the ;embed' address into the 'embed' bar at the bottom of your post window. See if that works.
it really is astounding how stupid these people are but at the same time what is more amazing is the stupid people parroting their stupid talking point and then act like cunts when you tell them they are wrong. wah wah wah.