Check that there isn't a short circuit in the wiring between that driver and the motor. Than ask for your board to be replaced under warranty. https://www.duet3d.com/warranty
That's not ideal because the wire joining the ground sides of the VIN terminal blocks is longer than ideal. However, although that could cause problems with communication between the two when the stepper motors are running, it doesn't explain why the DueX is not recognised by the Duet at startup. Please ask for your DueX5+cable to be replaced.