I’m having trouble understanding the documentation for the IAudioClient initialization function.
https://learn.microsoft.com/en-us/windows/win32/api/audioclient/nf-audioclient-iaudioclient-initialize

It’s about the difference return values;

E_INVALIDARG

and

AUDCLNT_E_UNSUPPORTED_FORMAT

The E_INVALIDARG description says “Parameter pFormat points to an invalid format description“.

However, in the description AUDCLNT_E_UNSUPPORTED_FORMAT “The audio engine (shared mode) or audio endpoint device (exclusive mode) does not support the specified format.”

What does it mean in E_INVALIDARG that the description format is “invalid”? I guess it’s not that it doesn’t fit the device, since it’s already handled by AUDCLNT_E_UNSUPPORTED_FORMAT?

And it’s also not that it is pFormat == NULL, since it’s already handled by E_POINTER

So what specific cases does this pFormat incorrectness is covered when return == E_INVALIDARG?