Nvidia-xconfig Not Recognizing --multigpu Option on Debian 12 (Bookworm) with NVIDIA Driver 550.120 and CUDA 12.4

Gaming and Visualization Technologies General Topics and Other SDKs GPU - Hardware
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I checked the advanced help for nvidia-xconfig using --A and found the following option:

--base-mosaic, --no-base-mosaic 
 Enable or disable the "BaseMosaic" X configuration option.

This resolved my issue.

Here is the updated result after adding this option:

nvidia-xconfig --device=Device0 --busid=PCI:1:0:0 --allow-empty-initial-configuration --enable-all-gpus --base-mosaic
----------------------------------------

Using X configuration file: "/etc/X11/xorg.conf".
Option "BaseMosaic" "True" added to Screen "Screen0".
Option "AllowEmptyInitialConfiguration" "True" added to Screen "Screen0".
Backed up file '/etc/X11/xorg.conf' as '/etc/X11/xorg.conf.backup'
New X configuration file written to '/etc/X11/xorg.conf'
----------------------------------------

Here is the content of the updated /etc/X11/xorg.conf file:
root@DEB-HPZ1G9To-4CE423BT3J:~# cat /etc/X11/xorg.conf

# nvidia-xconfig: X configuration file generated by nvidia-xconfig
# nvidia-xconfig:  version 550.135


Section "ServerLayout"
    Identifier     "Layout0"
    Screen      0  "Screen0"
    InputDevice    "Keyboard0" "CoreKeyboard"
    InputDevice    "Mouse0" "CorePointer"
EndSection

Section "Files"
EndSection

Section "InputDevice"

    # generated from default
    Identifier     "Mouse0"
    Driver         "mouse"
    Option         "Protocol" "auto"
    Option         "Device" "/dev/psaux"
    Option         "Emulate3Buttons" "no"
    Option         "ZAxisMapping" "4 5"
EndSection

Section "InputDevice"

    # generated from default
    Identifier     "Keyboard0"
    Driver         "kbd"
EndSection

Section "Monitor"
    Identifier     "Monitor0"
    VendorName     "Unknown"
    ModelName      "Unknown"
    Option         "DPMS"
EndSection

Section "Device"
    Identifier     "Device0"
    Driver         "nvidia"
    VendorName     "NVIDIA Corporation"
    BoardName      "NVIDIA GeForce RTX 4060"
    BusID          "PCI:1:0:0"
EndSection

Section "Screen"
    Identifier     "Screen0"
    Device         "Device0"
    Monitor        "Monitor0"
    DefaultDepth    24
    Option         "BaseMosaic" "True"
    Option         "AllowEmptyInitialConfiguration" "True"
    SubSection     "Display"
        Depth       24
    EndSubSection
EndSection

I’m sorry, but I’m new to this.

Is this the correct approach to fix the issue?
The actual error was related to the --multigpu=Mosaic option, which is not recognized by nvidia-xconfig.