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The PDF/A is a specialised format. It is used for archival purposes by many governments worldwide. As the standard was developed with archiving in mind, the format purposefully does not include support for hyperlinks (even ones between pages) as they can degrade over time.
Make sure you convert to PDF Interactive instead.
Thanks for the response! I'm glad at least know PDF/A doesn't support links, even internal ones. My thought was that we like to archive documents that can have hundreds, sometimes thousands of pages. Without links, it seems quite onerous to navigate such a document. I guess Bookmarks would be the 'solution' there for PDF/A?
Yes, if you are going to use the PDF/A format, you will need to use bookmarks as they are self-contained.
Hmmm. I hadn't heard of this limitation. Indeed, http://www.pdfa.org/2011/08/pdfa-–-a-look-at-the-technical-side/ says "With regard to hyperlinks, the special ‘Link’ annotation type is permitted with or without activated ‘Appearance’. " Maybe this document is being generated with a different kind of annotation.