We're sorry for the delayed response and inconvenience caused. As per the description above, you are getting conversion failure error when converting a PDF to Excel, Is that correct?
The record shows that you are subscribed to Adobe ExportPDF service, try exporting the PDF file through the URL https://cloud.acrobat.com/exportpdf with your Adobe ID and password on a browser like Chrome, or Firefox, or Safari and see if this brings any difference.
Make sure that the file you're converting is 100 MB or smaller. (Export PDF doesn't accept files larger than 100 MB.)
Note: Even when a file is smaller than 100 MB, Export PDF may not be able to convert it if it's overly complex. For example, a file that has a large number of pages, or contains many different fonts and graphics, could be too complex for Export PDF to process before the service times out.