My situation is pretty much the same as these two threads:
So I guess it’s a common problem, but I don’t know about the solution. I confirmed that fmodstudioL.dll is located under Assets/Plugins/FMOD/lib/win/x86_64 in my Unity project, and Plugins/x86_64 in the data folder in the Windows build.
Also make sure that “Assets/Plugins/FMOD/lib/win/x86/fmodstudioL.dll” is only ticked for x86
Other than that, try reinstalling the FMOD Unity Integration. If it’s still not working, please provide your FMOD and Unity versions, and which platform you are building too, and I will take a closer look!