SetWindowsHookEx always returning 0 with error code 87 (ERROR_INVALID_PARAMETER) in .net 8 WPF

Question

In my application I would like to register a hook per SetWindowsHookEx. Basically I would like to execute some code, whenever a mouse event occurs.

The method however, always returns 0. The last error code per Marshal.GetLastWin32Error is 87 (ERROR_INVALID_PARAMETER), I'm not sure which parameter is faulty.

I have set a breakpoint in the HookProc, but it is not beeing hit. I've also tried this in a test project and it didn't work there either. I'm not entirely sure what I'm doing wrong here.

// SetWindowsHookEx import:
[DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
public static extern int SetWindowsHookEx(int idHook, HookProc lpfn, IntPtr hInstance, int threadId);

// WH_MOUSE:
public const int WH_MOUSE = 7;

// _hookProc is of the following type:
public delegate int HookProc(int nCode, IntPtr wParam, IntPtr lParam);

// SetWindowsHookEx call:
int hHook = SetWindowsHookEx(WH_MOUSE, _hookProc,(IntPtr)null,Environment.CurrentManagedThreadId);