...SOLUTION...
Hi,
im running Big Sur 11.4 on an M1. I installed everything from the Autodesk page Reality Composer is linking to. But it didn't work.
this worked.
https://www.autodesk.com/developer-network/platform-technologies/fbx-sdk-2020-0
Mac
FBX Python SDK Mac
i don't know if you need anything from here but since I installed everything first you can do it second if the above not works on its own.
https://www.autodesk.com/developer-network/platform-technologies/fbx-sdk-2020-2-1 i
3dpole
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Aachen, Deutschland