If you are using MacOS 10.15 (Catalina) you may run into this error:
You will need to whitelist the FMOD libs to allow Unity to use them.
Find the files:
1.10 - %ProjectDir%/Assets/Plugins/fmodstudioL.bundle
2.0 - %ProjectDir%/Assets/Plugins/FMOD/lib/mac/fmodstudioL.bundle
Control click the file and select “Show Package Contents”.
Navigate to:
Contents/MacOS/fmodstudioL
Control Click the file and select “Open”.
At the popup select “Open”.
