Only MS Office files can't "Print to PDF" - no problem on other apps

I open a blank Word file, type in some text, click File > Print > choose Adobe PDF > Desktop > Save. Then I get an error from Acrobat: "There was an error opening this document. This file cannot be found." Same error when trying Excel/PowerPoint/Outlook. When I try Chrome or Notepad, no problem. Kicker: it works in the MS apps when I choose File > Save as Adobe PDF. I tried Repairing Acrobat, Restarting, no Acrobat updates, no Office/Windows updates. Latest version (subscription) of Acrobat 2025.001.20643. Latest version of Office 365. The COM add-in is enabled in all MS apps. Windows 11 Enterprise. What am I missing?