Hi Jillb,
We have checked your account but couldn't find any active subscription under the current account. You might have made the purchase under a different email address.
Adobe Export PDF is a Document Cloud service, which works online via web browser https://cloud.acrobat.com/
However, you can use it via web browser Adobe Reader DC- 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 Services).
Hope this helps.
Regards,
Akanchha