Adobe Acrobat Pro DC may display the following error when attempting to convert a Microsoft Office document to PDF:
"There was an error opening this document. You need to be connected to the internet and signed into Acrobat to use this feature. Please check and retry."
Disable the "Use Adobe Create PDF cloud service" option. To disable the option, do the following:
The instructions above are also published in the following Adobe help article - https://helpx.adobe.com/acrobat/using/whats-new.html#RichPDFMacOS