When I try to use Export pdf it takes me to the Purchase screen.

Hi J.J,

I see that you have the Export pdf subscription registered to this account. So there shouldn't be any problem accessing the service.

Adobe Export PDF is an online service that you can access online via- https://cloud.acrobat.com/exportpdf

As well as through the Adobe Reader DC desktop application- 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.

Also, I assume that you have been trying to access your 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 service and "Signed In" using correct email.

For any troubleshooting, refer to- https://forums.adobe.com/docs/DOC-8841

Hope this helps.

Regards,

Akanchha