Hi Preciousd,
As I understand from the description above, you are not able to use the Adobe ExportPDF services which you purchased on your Adobe ID, Is that correct?
As per the records, you have an active subscription of Adobe ExportPDF on your Adobe ID Using Adobe Export PDF
To use the services, you can sign in to your account at https://cloud.acrobat.com/exportpdf with your Adobe ID and password
With the free desktop version of Acrobat Reader DC, you can use the services of ExportPDF, make sure you are logged in with your Adobe ID in Acrobat Reader DC.
Let us know how it goes.
Regards,
Anand Sri.