I believe the 2020 34 still used 2016 era top cap ucups.
That’s good news as you just need an ident spring and ball bearing and the fit4 dialset.
Part 820-05-330-KIT I think
It’s a super easy swap. Take the tension off the remote remove the grub screw and remove cable/housing.
Undo the screw that holds the top cap dial in place and pop the whole dial and cable housing up and off the damper shaft. There is a friction fit seal (maybe not for 2016) so it can be a decent pull.
Clean it out, use a bit of thickish grease to help install the spring and ball bearing (hardest part) then drop the washer over and secure with c clip. align the damper shaft to open and install the blue lever in the appropriate open position. Then install the black dial and fix in place with the screw.
You’re not opening the damper at any point
Fox swapped to a different ucup at some point which didn’t have the indent pocket so from some point (depending on product family) you have to buy a new ucup as well.