Hi @wh6Q9NU ,
There are couple of things to consider
1.Can you verify that on your mac following directory is present and does it contain fusion modules mainly _init.py,core.py,fusion.py & cam.py etc.? Directory-
"~/Library/Application Support/Autodesk/Autodesk Fusion 360/API/Python/defs".
Solution-(Already this has been addressed and fix will be available in December release). If this is missing you can copy defs directory from your fusion app installed location like "~/Library/Application Support/Autodesk/webdeploy/<currentInsatlledbuild>/Autodesk Fusion 360/contents/API/Python/packages/adsk/defs" to the directory "~/Library/Application Support/Autodesk/Autodesk Fusion 360/API/Python/defs"
2.One more thing, once script is opened from fusion for edit/debug mode in VScode; fusion will generate setting.json file in "script_folder\.vscode".
Can you check that does setting file contains a node "python.autoComplete.extraPaths" which should point to directory "~/Library/Application Support/Autodesk/Autodesk Fusion 360/API/Python/defs".
Solution-(Fusion automatically creates proper setting.json file with node. Still)
You can add node in setting.json file as
"python.autoComplete.extraPaths":[ "~/Library/Application Support/Autodesk/Autodesk Fusion 360/API/Python/defs"]
Please let us know if this works for you and if you need any more help.

Nilesh Mohite
LinkedInIf my answer helped you, please use ACCEPT SOLUTION .
Also be generous with Likes! Thank you and enjoy!