Hi Kenc,
I see that you are a subscriber of Export PDF subscription and its register to your account.
1- As shared, Adobe Export PDF https://helpx.adobe.com/document-cloud/help/using-exportpdf.html is an online service that you can access via web browser- https://cloud.acrobat.com/exportpdf
2- You can also use the services through free desktop version of Adobe Reader- Adobe Acrobat Reader DC Install for all versions
3- You just need to “Sign In” using the email (Adobe ID) under which you have subscription registered.
4- 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
Let us know if its still doesn't work.
Regards,
Akanchha