https://forum.groupdocs.com/t/pdf-to-pdf-2a-conversion-using-net/13162/9
I have changed the library version to 23.3.0 it’s work fine.
What I need. Are there any way to change the pdf file Conformance
Standard: PDF/A-2…...might arise due to the using keyword, which disposes of the stream...default, Creator = default, Keywords = default, ModDate = default...