Problems invoking functions related to digital signature in PubSig in Acrobat reader plug-in

Hello.

I'm developing Acrobat reader plug-in.
I would like to display additional images (Valid, Invalid, ...) at the signature appearance location of the digitally signed document.
Adobe Reader Integration Key License (RIKLA) has been received.

I'm building DocSign from Plug-in sample source and then connecting and checking digitally signed documents.
GetBoolProperty, getAtomProperty, getTextProperty, and sessionAcquire callback functions are called.
However, functions related to digital signatures such as sigGetSigProperties, sigGetSigValue, sigCreateAPNXObj, sigValidate, getLogo are not called.

Need additional settings?

Can you tell me what I'm doing wrong?