Acrobat Reader DC: Signature undetected

I am reporting a problem in detecting the signature in a document that contains a form.

The document is signed whit my certificate and the signature is detected and verified by Arubasign and by **** but not by Acrobat Reader DC.

I need support for this issue.

I did try to sign the empty document, the document with the form fulfilled, the document with the form partially filled but the result was the same: Acrobat Reader reports no signature vs ArubaSign and **** reporting a valid signature.

Of course the document is signed in PADES standard.

Mario