Official comment
Did you check this?

Open the mixer panel in rekordbox and verify the channel assignments for the crossfader. Blue = enabled.
ddj-flx6 crossfader is not working on rekord box at all and im not the only one having this damn issue either u meaning pioneer fix this issue and yes im fully updated in all firmware and drivers ever since rekord box updated to 6.6.8 I can't use my controlller on rekordbox
Did you check this?

Open the mixer panel in rekordbox and verify the channel assignments for the crossfader. Blue = enabled.
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Ddj 400
Quero começar a tocar
Yes I have tried that is doesn't fix the issue at all I even uploaded driver firmware everything the crossfader doesn't work u can play both decks at same time even tho the crossfader in on deck 1 and deck 2 is playing
Rekordbox either lost the ddjflx6 driver's or something isn't right
just bought the flx6 and cant use faders both decks can play at the same time no matter what side the faders on can someone help other wise these controllers are useless to own