Hi there,
Hope you are doing well.
Your account details shows that you have an active subscription for the Acrobat Export PDF. Since its an web based service, so you have to logging on Document Cloud https://documentcloud.adobe.com/link/home/ website to be able to use its features, like conversion of PDF to Word.
Or on the other hand, you can access this feature from Acrobat Reader DC desktop application. What exactly happen when you try it through the desktop app?
Note: Make sure you are working with freeware Reader DC not the paid version Acrobat Pro DC
Thanks,
Akanchha