What I did after reading other comments. I released the lever latches on both sides of the back seats and reseated them. I also checked the headrests. Then I addressed the 2 seat latches someone else mentioned, on the bottom of the front of the rear seats. The little, poorly engineered in my opinion, latches that hold the seats down. They're a bit inconspicuous and may be hard to see. I think one of them was incorrect. When I made sure both were correctly latched, I took my 2020 Edge for a test drive. It seems to have worked! So, if you're experiencing that very annoying spring type rattle as I was, it is apparently the rear seat hook, bouncing on the bracket piece it is supposed to be inserted into. Good Luck!
Rare
