Acrobat Reader plugin signature yellow question mark

I develop a plugin for digital signature (mainly for the reader but should work as well in Acrobat format). I have a basic proof of concept works, with the signing and verification and custom signature appearance, but I am getting a yellow question mark great displayed behind my appearance.

I've seen other posts on this forum who suggested the certificate must be approved, but I did and I always get the question mark.

What could I do it wrong? What should I do to make the question mark disappears?

(I'm in dev/test with Acrobat Reader DC and a certificate self-signed on Windows 10.)

Answered my own question (with a little help from this forum and the good people at Adobe):

Forum: "the multilayer model for appearances of digital signature in PDF format has been deprecated and is no longer part of the ISO standard for PDF (ISO 32000 - 1).»

The value default, kindly added by Acrobat/Reader, for the layer of n1, if I do not set anything, is this big ol' ' point yellow question mark. The solution is simply to make optional the L1 layer and the question mark disappears.

Tags: Acrobat

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