@Husam2020 I had the same issue "Missing FBX Python" with 2020 FBX SDK on M1 Mac. I solved the problem after I installed 2019.5 FBX SDK, FBX Python Bindings.

I had the issue on M1 Mac and solved it. Open Rosetta Terminal and run USD.command and usdzconvert in Applications/usdpython folder. Locate the Terminal application within the Utilities folder (Finder Go menu Utilities) Select Terminal.app and right-click on it, then choose “Duplicate” Rename the duplicated Terminal app something obvious and distinct, like ‘Rosetta Terminal’ Now select the freshly renamed ‘Rosetta Terminal’ app and right-click and choose “Get Info” (or hit Command+i) Check the box for “Open using Rosetta”, then close the Get Info window Run the “Rosetta Terminal”