I tried leaving off the IP address and I get the same error. I was actually entering the command at the console of the PanelDue. I doubt it's relevant, but the end of the IP address runs off of the text entry space to the right and out of sight, and since it's not echoed to the screen I can't verify that the entire command is in fact being sent.

I just connected to it via USB and sent the same command in TeraTerm and it works fine.

I cannot get the access point configured. Here are the commands I enter at the console:

M552 S0
M589 S"DUETABCD" P"DUETABCD" I192.168.1.100

At this point, I receive the following error:

Error: M589: Bad or Missing Parameter

Here are my firmware versions:
Firmware Electronics: Duet WiFi 1.02 or later
Firmware Version: 2.02(RTOS) (2018-12-24b1)
WiFi Server Version: 1.23
Web Interface Version: 1.22.6

I have tried many combinations of SSID, password and IP address and they all fail with the same error. Any help would be greatly appreciated.

I figured it out. It was just an issue with the home macro files that were generated by the configurator.

I have a CoreXY setup, where the trigger is setup at the bottom of the machine, which is the Z maximum. All of my endstops are active high. I am using the command:

M574 X1 Y1 Z2 S1

When I home the Z axis, it triggers properly. But I am unable to jog the Z axis in the negative direction. It lets me jog it in the positive direction, which causes it to crash into the frame, ignoring the Z endstop. I have tried reversing the motor direction to no avail. Does this make any sense at all?