[Bug Report] MJCF headless conversion

[RumblingTurtle]

Describe the bug

Hi, I'm currently migrating from IsaacLab 1.4.1 to 2.2.1 and headless mode MJCF conversion seems to be impossible on the newer version

Steps to reproduce

mre.zip

I attached the necessary files to reproduce the bug

IsaacSim conversion example script successfully converts the xml in both headless and normal mode

python convert_sim.py

Isaaclab on the other hand can only convert the xml in windowed mode

python convert_isaaclab.py

If using headless mode the example crashes due to absence of MJCFCreateImportConfig

python convert_isaaclab.py --headless

2025-12-02T07:49:07Z [4,298ms] [Error] [omni.kit.commands.command] Can't execute command: "MJCFCreateImportConfig", it wasn't registered or ambigious.

System Info

Describe the characteristic of your environment:

• Commit: 0f00ca2
• Isaac Sim Version: 5.0.0-rc.45+release.23960.184afb15.gl
• OS: Ubuntu 22.04
• GPU: RTX 5080
• CUDA: 12.8
• GPU Driver: 570.195.03

Additional context

Add any other context about the problem here.

Checklist

• I have checked that there is no similar issue in the repo (required)
• I have checked that the issue is not in running Isaac Sim itself and is related to the repo

Acceptance Criteria

• python convert_isaaclab.py --headless successfully converts the asset