Hi Kims,
Adobe PDF Pack is an online service that you can access through web browser. This is not an application that you can install on your computer.
I assume you are referring to the free application Adobe Reader DC, through which you might be using your PDF Pack services?
There is a possibility that Adobe Reader DC set as a default application to open pdf files, and that is the reason print to Microsoft PDF isn't working.
To remove Adobe Reader DC as default pdf viewer you can simply change the settings given in the help document below, which are suggested to make it default-
Associate PDF files to always open in Acrobat or Reader on Windows 10
Hope this works.
Regards,
Akanchha