Hello,
DisplayPort daisy chaining requires Multi-Stream Transport (MST) which is not supported by the DisplayPort transmitter, chips or firmware, used by Humanscale in their product.
The
user guide page 15 mentions their dock is DisplayPort 1.2.
MST was introduced in DisplayPort 1.3 but is not supported by all devices doing DP 1.3.
This is not a driver only limitation but a hardware one.
I am sorry but DP MST will never be possible with this product.
Kind regards,
Alban