It appears when I try it... What options do you see in the "Convert To" drop-down menu?
You have subscribed for Export PDF subscription its not Adobe PDF Pack. Adobe Export PDF is an online Adobe Document Cloud service. With it, you can easily convert PDF files into editable Word, Excel, or RTF (Rich Text Format) documents. Using Adobe Export PDF
Its doesn't let you to convert in PPT format. If this would have been PDF Pack then you would have got .ppt file format to export PDF.