Saving Word/Excel File to PDF now using Untitled.pdf by default

If updating Office doesn’t resolve this, check with the Office for Mac forums at the Microsoft website, then ask Microsoft Support.

Contact a third-party vendor - Apple Support

Here’s the Microsoft Office for Mac search function, and which also has an Ask a new question link:

https://answers.microsoft.com/en-us/msoffice/forum/msoffice_word-msoffice_OfH-mso_OPMac?sort=LastReplyDate&dir=Desc&tab=All&status=all&mod=&modAge=&advFil=&postedAfter=&postedBefore=&threadType=all&isFilterExpanded=true&page=1