We apologize for the inconvenience caused, as per the description above, you are not getting the option to Export a PDF file as JPG, Is that correct?
The record shows that you are subscribed to an active subscription of Adobe PDFPack on your current Adobe ID. Please try to access the services through the URL https://cloud.acrobat.com/convertpdf with your current Adobe ID and password in a different browser like Chrome or, Firefox, or Safari.
You can also use the free desktop version of Adobe Reader to use the services of Adobe PDFPack. Sign in with your Adobe ID and password in Adobe Reader.
To download Adobe Reader, use the following URL Adobe - Adobe Acrobat Reader DC Distribution
For more troubleshooting, refer to Troubleshooting Create PDF, Export PDF, Adobe Send, Fill & Sign … services(PDFPack or Document Cloud...
Hope this helps, and let us know how it goes.