@JMS728
I had a similar Problem, in the Pins-File you have to define Pins for X-/Y-/Z-axis and E0 to Ex for the rest of the Stepper-Drivers. If you then enable "X_DUAL_STEPPER_DRIVERS" in configuration_adv.h X2 will be assigned to E1 or E2 depending if you have 1 or 2 Extruders. So you have to have unused E-Drivers.
I hope this will help you.
I had a similar Problem, in the Pins-File you have to define Pins for X-/Y-/Z-axis and E0 to Ex for the rest of the Stepper-Drivers. If you then enable "X_DUAL_STEPPER_DRIVERS" in configuration_adv.h X2 will be assigned to E1 or E2 depending if you have 1 or 2 Extruders. So you have to have unused E-Drivers.
I hope this will help you.