Ahh, OK. It was not clear from the first post what was the impact.
You may want to try to roll bones straight in Blender. You can do one side only and then use Mirroring in CC Adjust Bones to replicate to the other side.
You can also submit to FT as Justaviking suggested, but that could be a long wait with no guaranty for immediate solution.
One more suggestion is to try this: https://forum.reallusion.com/FindPost469889.aspx (it would either fix it, or distort fingers even more :))

It won't provide an immediate solution, but I suggest you report this as a Bug in Feedback Tracker.
Good luck.

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iClone 7... Character Creator... Substance Designer/Painter... Blender... Audacity...
Desktop (homebuilt) - Windows 10, Ryzen 9 3900x CPU, GTX 1080 GPU (8GB), 32GB RAM, Asus X570 Pro motherboard, 2TB SSD, terabytes of disk space, dual  monitors.
Laptop - Windows 10, MSI GS63VR STEALTH-252, 16GB RAM, GTX 1060 (6GB), 256GB SSD and 1TB HDD

Playing the same animation on both my model and the default model gets different finger orientations (look at the finger nails):




When the model hits unreal the local axis of the finger is incorrect. It should be closer to my scribble on the right based on the pose of the finger.




The default model has correct rotation axis in cc and in unreal

That is correct, no need to fix it. In CC bones rotation is Local and is not relevant to Global axis direction.
(that is true for any character, not only yours)

Contractor has delivered some models where the finger axis are wrong.



I suspect this is a result of several round trips with zbrush and the bind pose changing along the way, then CC recalculating the axis incorrectly.

There is no option to adjust the bone's roll in "Adjust bones"



Any ideas how I can fix this?

Thanks