Hello PABresler, I'm Johrelle a fellow Windows/Microsoft user. I'm happy to assist you.
Try restarting the Fax service. Press Win + R, type "services.msc", and press Enter. Locate the "Fax" service, right-click it, and select "Restart."
If you're using a fax server, ensure it's online and accessible. Check your network connection and the server's configuration. If not, verify the line is working correctly. Try sending a test fax from another device if possible.