Hello Perl,
We're sorry for the trouble you had, are you trying to save the PowerPoint files as PDF or as 'Adobe PDF'? If you are subscribed to Acrobat license, then only you can convert the PowerPoint files into Adobe PDF.
I have checked the records with your current Adobe ID and you are not subscribed to any Acrobat license/subscription.
Microsoft has its own built-in feature to convert files into PDF, but not in Adobe PDF and the inbuilt feature may not convert the files into a high-quality Adobe PDFs.
If you have the license of Acrobat, you can try printing the PowerPoint to Print as Adobe PDF or save it as Adobe PDF. You can also change the conversion settings and choose High-Quality Print.
Let us know if you have a different query/issue and feel free to update this discussion for any further assistance.
Thanks,
Anand Sri.