We have checked your account information and found an active subscription on Adobe PDF Pack.
Adobe PDF Pack https://helpx.adobe.com/document-cloud/help/using-pdfpack.html is an online service that you can use via web browser https://cloud.acrobat.com/convertpdf or
You can also use the services through free desktop version of Adobe Acrobat Reader DC- Adobe Acrobat Reader DC Install for all versions
You just need to “Sign In” using the email under which you have subscription registered.
I assume that you have been trying to access your PDF Pack subscription through wrong application Adobe Acrobat DC not Reader DC?
Please ensure that you are working with Adobe Reader DC not Acrobat DC to access PDF Pack and "Signed In" using correct email.
For any troubleshooting, refer to- https://forums.adobe.com/docs/DOC-8841