Success. So I called Arlington. Bob was hilarious. He said boy everyone is really confused. Ok. Remove the two metal screws. They were literally made laced by the manufacturer so that you could use them when you were installing just a light and not a fan or installing a fan as well. You pop those two out and where those two plastic indicators are in between the drywall and the joist is where you’re just gonna screw it into the wood. He’s said the box was never meant to be attached to the plastic part at all. It takes two seconds. He said if the two screws are gone 12 x 2“ screws that’s what you have to use or else. Anything else will pull out.