Hi Ross! My name is Ben a fellow member here in the community.
Just to add up to the answers provided by others above, you can also try the following steps below to troubleshoot the app version of Word:
- Quit Word, then restart your Mac.
- Open the Word document and try File > Save As > PDF again.
If the same issue persists, try to re-create the document by creating another copy. You can try these:
- Save a new copy of your document with a different name.
- Try exporting just a few pages (e.g., File > Print > PDF, then select a page range).
- If that works, the issue may be with a specific page (e.g., corrupted image, table, font).
- Remove or replace content on the suspect page and try again.
Also don't forget to check if there are any updates on your Word app by checking it on the App Store.
I hope the information helps!