GetCurrentReading crashes with COMException 0x838A0003

I can see that readings are being generated .. assuming timestamps are provided by readings.

Debug.WriteLine(Win32GameInput.GetCurrentTimestamp());

GameInput initialized!
13432148796398758
13432148796440725
13432148796486802
13432148796533528
13432148796579211

But when I try to get a reading

if (Win32GameInput is null) return;
Debug.WriteLine(Win32GameInput.GetCurrentTimestamp());
Win32GameInput.GetCurrentReading(GameInputKind.GameInputKindUnknown, null, out IGameInputReading reading);
Debug.WriteLine($"Reading: {reading}");

I get...

GameInput initialized!
13432149290539465
Exception thrown: 'System.Runtime.InteropServices.COMException' in Input.dll
An unhandled exception of type 'System.Runtime.InteropServices.COMException' occurred in Input.dll
0x838A0003