This finally works.
Lights up 4 red leds when above 40C, green <=40
Bed and T0 heater are set to 4 leds each.

Make sure each if and elif M150 conmmend has a beginning space

; dameon.g
; Adafruit #1426 8 led neopixel
G4 P500 ; 500ms delay
if heat.heaters[0].current > 40     ; temp
 M150 R255 P10 S4 F1     ; set first 4 red
elif heat.heaters[0].current <= 40
 M150 U255 P10 S4 F1     ; set first 4 green
if  heat.heaters[1].current > 40    ; temp
 M150 R255 P10 S4 F0     ; set second 4 red, and done
elif heat.heaters[1].current <= 40
 M150 U255 P10 S4 F0     ; set second 4 green and done

This is in my config.g to make sure the NEOPixels are off

M150 R0 U0 B0 P5 S8 F0                                   ; shut off neopixel

@uca I dont't one. One way is when you home one, make sure the other isn't triggered. For example: in the homeall.g file: home x, move x away from the endstop so it's not triggered, home z. Just put a move away form the endstop for one, to use the other. You may have to connect them to both endstop connectors until the firmware can freely assign endstops.

@Roy Remove the bang, !, in front of the zprobe.in the M558.

@army61 One wire to the ground pin and the other to the signal pin. The 3.3v pin is not used.

Go to System and use the "upload system files button" in DWC2.

@tomw When using a Raspberry PI. all updates must be doen with sudo apt update and sudp apt upgrade. To use the current beta version switch to unstable. I use PuTTY to acces the PI.
https://duet3d.dozuki.com/Wiki/Getting_Started_With_Duet_3#Section_Software_Installation

@TLAS For number 4. You could use this https://www.amazon.com/gp/product/B01HU7BX42 on the supplied wire connector.

Fan 1 defaults to thermostatic. Did you turn that off?

https://duet3d.dozuki.com/Wiki/Connecting_and_configuring_fans

To me, it looks like it is under extruding and the Z0 isn't close enough to the bed.

Update:

The pi4 was showing the low voltage lightning on the screen. Now powering from a 5vdc Meanwell.

@tomw When using a Raspberry PI. all updates must be doen with sudo apt update and sudp apt upgrade. To use the current beta version switch to unstable. I use PuTTY to acces the PI.
https://duet3d.dozuki.com/Wiki/Getting_Started_With_Duet_3#Section_Software_Installation

@tlas There are extensions available for the antenna. I use one on my Duet 3 Mini to put it on top of the printer.

@tlas Use the WIFI version and the ethernet won't be needed. With the ones with sdram, you would only need power and gpio to the duet. If you want to write to the sdram, you'll need a usb slave port and the pins to enable writing to it or the IO board to put the OS on it. I wish I could design one.

@dvd479 I use M906 X800 Y800 Z800 E800 I30 for the stepper currents on my CoreXY. I believe the 300 your using is not enough.

@arnold_r_clark I use two different ones, depending on the wire/crimp size:
https://www.amazon.com/gp/product/B07G98DLB8 and https://www.amazon.com/gp/product/B078WNZ9FW

I crimp the wire then the strain relief.

@armatus When I used a proximity sensor, I used a 24 relay module to connect it to my Duet Wifi. Never had a problem with it.
https://www.amazon.com/gp/product/B077ZLC78L

@fcwilt G28 homes the Z with a G30. Why does it need the G30 again?

@col_clucks This may help, here's the one I use:

; bed.g
; called to perform automatic bed compensation via G32
M561 ; clear any bed transform
if !move.axes[0].homed || !move.axes[1].homed || !move.axes[2].homed
 G28
M290 R0 S0    ;  clear baby stepping
G30 P0 X44 Y140 Z-99999 ; probe near a leadscrew, half way along Y axis
G30 P1 X265 Y140 Z-99999 S2 ; probe near a leadscrew and calibrate 2 motors
G29 S1 ; load heightmap.csv
if result > 1 ; if no heightmap.csv, make one
 G29 S0

@wolfgang-klein https://duet3d.dozuki.com/Wiki/Installing_and_Updating_Firmware#Section_Duet_3_Mini_5_WiFi_Ethernet

@achrn This is what I use for the start g-code, only have one hotend:
T-1 ; deslect T0
M98 P"/macros/PLAOffset" ; set z probe offset
G10 P0 S[first_layer_temperature] R140
M190 S[first_layer_bed_temperature]
G28 ; home all axes
G32 ; bed calibration
T0
M116
G1 E2 ; extrude a bit