As mentioned above, that you are a subscriber of Adobe Export PDF https://helpx.adobe.com/document-cloud/help/using-exportpdf.html
Adobe Export PDF is an online service that you can access online via- https://cloud.acrobat.com/exportpdf
You can also use the services through free desktop version of Adobe Reader- Adobe Acrobat Reader DC Install for all versions
You just need to “Sign In” using the email (Adobe ID) under which you have subscription registered.
For any troubleshooting, refer to- Troubleshooting Create PDF, Export PDF, Adobe Send, Fill & Sign … services(PDFPack or Document Cloud...
Let us know if you still experience the same problem.