error.validation.verifyDocument.documentExtractError

Hi there, I am hitting this endpoint: "/packages/:packageId/documents" in an attempt to add a PDF document for esigning. The PDF was converted from HTML by Puppeteer (a node dependency). I am using text anchors to place signature boxes in the PDF, of which I have already embedded the unique text in the PDF.

This previously worked when PDFs were generated by CloudConvert API, however, now with Puppeteer, it does not seem to work. I am unable to find sufficient information online to help with this.