I filed the top side of the sticky outy thing that locks the cap until it closed with just a bit of friction. Lubes didn't help until I did that. Place a rag over the hole and file away. Or do what I did and take it apart and file or grind.
Ours is a red, black and chrome 2017 F3 Limited. Bought new in 2/2019. The avatar is my first bike back in 1952, a Simplex Servi-Cycle. Photo taken at the Barber Museum.