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I am trying to compensate for bed leveling by measuring a mesh with my Z probe, a BLTouch, and I am unable to do so.

I am using RepRap firmware version 3 and have a CoreXY printer. The first thing I do is home all axes, which works fine, and then choose G29 (run mesh compensation). The mesh compensation then begins to lower the bed and it eventually hits the Z limit switch and keeps going and the steppers begin grinding.

Don't know how the mesh compensation works but this is my config.g file. Does anyone know what may be the issue?

    ; Configuration file for Duet 3 (firmware version 3)
    ; executed by the firmware on start-up
    ;
    ; generated by RepRapFirmware Configuration Tool v3.2.3 on Wed Jun 23 2021 23:47:21 GMT-0400 (Eastern Daylight Time)
    
    ; General preferences
    G90                                             ; send absolute coordinates...
    M83                                             ; ...but relative extruder moves
    M550 P"Duet 3"                                  ; set printer name
    M669 K1                                         ; select CoreXY mode
    
    ; Drives
    M569 P0.0 S1                                    ; physical drive 0.0 goes forwards
    M569 P0.1 S1                                    ; physical drive 0.1 goes forwards
    M569 P0.2 S1                                    ; physical drive 0.2 goes forwards
    M569 P1.1 S1                                    ; physical drive 1.1 goes forwards
    M569 P1.2 S1                                    ; physical drive 1.2 goes forwards
    M584 X0.0 Y0.1 Z0.2:0.3:0.4:0.5 E1.1:1.2                    ; set drive mapping
    M350 X16 Y16 Z16 E16:16 I1                      ; configure microstepping with interpolation
    M92 X40.00 Y40.00 Z400.00 E420.00:420.00        ; set steps per mm
    M566 X900.00 Y900.00 Z60.00 E120.00:120.00      ; set maximum instantaneous speed changes (mm/min)
    M203 X6000.00 Y6000.00 Z120.00 E1200.00:1200.00 ; set maximum speeds (mm/min)
    M201 X500.00 Y500.00 Z10.00 E250.00:250.00      ; set accelerations (mm/s^2)
    M906 X1500 Y1500 Z1500 E800:800 I30             ; set motor currents (mA) and motor idle factor in per cent
    M84 S30                                         ; Set idle timeout
    
    ; Axis Limits
    M208 X0 Y0 Z0 S1                                ; set axis minima
    M208 X635 Y540 Z500 S0                          ; set axis maxima
    
    ; Endstops
    M574 X1 S1 P"!io4.in"                           ; configure active-low endstop for low end on X via pin !io1.in
    M574 Y1 S1 P"!io5.in"                           ; configure active-low endstop for low end on Y via pin !io5.in
    M574 Z2 S1 P"!io3.in"                           ; configure active-low endstop for low end on Z via pin !io3.in
    
    ; Z-Probe
    M950 S0 C"io7.out"                              ; create servo pin 0 for BLTouch
    M558 P9 C"^io7.in" H7 F120 T6000                ; set Z probe type to bltouch and the dive height + speeds
    M558 H30                                        ;*** Remove this line after delta calibration has been done and new delta parameters have been saved
    G31 P500 X0 Y0 Z2.5                             ; set Z probe trigger value, offset and trigger height
    M557 X15:215 Y15:195 S20                        ; define mesh grid
    
    ; Heaters
    M308 S0 P"temp1" Y"thermistor" T100000 B4138    ; configure sensor 0 as thermistor on pin temp1
    M950 H0 C"out1" T0                              ; create nozzle heater output on out1 and map it to sensor 0
    M307 H0 B0 S1.00                                ; disable bang-bang mode for heater  and set PWM limit
    M143 H0 S280                                    ; set temperature limit for heater 0 to 280C
    M308 S1 P"temp2" Y"thermistor" T100000 B4138    ; configure sensor 1 as thermistor on pin temp2
    M950 H1 C"out2" T1                              ; create nozzle heater output on out2 and map it to sensor 1
    M307 H1 B0 S1.00                                ; disable bang-bang mode for heater  and set PWM limit
    M143 H1 S280                                    ; set temperature limit for heater 1 to 280C
    
    ; Fans
    M950 F0 C"out7" Q500                            ; create fan 0 on pin out7 and set its frequency
    M106 P0 S1 H-1                                  ; set fan 0 value. Thermostatic control is turned off
    M950 F1 C"out8" Q500                            ; create fan 1 on pin out8 and set its frequency
    M106 P1 S1 H-1                                  ; set fan 1 value. Thermostatic control is turned off
    
    ; Tools
    M563 P0 D0 H1 F0                                ; define tool 0
    G10 P0 X0 Y0 Z0                                 ; set tool 0 axis offsets
    G10 P0 R0 S0                                    ; set initial tool 0 active and standby temperatures to 0C
    
    ; Custom settings are not defined
    
    ; Miscellaneous
    M575 P1 S1 B57600                               ; enable support for PanelDue
```
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