Unreal (5.4.4 and 5.6 Preview) Lightmass on Mac stopping at 0%

Hello there @GameAnim!

Checking around the community, baked lighting is supported on Apple Silicon, but it does come with a few quirks and conflicts. The overall recommendation in those threads was to switch to Lumen instead. Since your build is not returning a concrete error, it would be a good approach to test.

To setup lumen in your scene, go to Project Settings > Rendering Global Illumination, then set “Dynamic Global Illumination” and “Reflection” methods to Lumen.

You can find further information on the feature following the guides below: