Hi, I dont know if this should be posted here, but didnt find where

I bought a Fuel EX8, and a Fox DOSS seatpost, but I have the same problem shown in the following video

https://www.youtube.com/watch?v=ktJW41gE66Y

Followed the advices in the comments, but the noise and the movement is still there.
Any advices or way to fix it?
Thanks