If the Windows Fax and Scan not working in Windows 11, you can try some working fixes described in this article to resolve the issue.

Here are different methods to open Fax Cover Page Editor in Windows 11, as well as how you can use it to create a fax cover sheet/letter.

Microsoft fixes Windows 11 scanner bug “After installing Windows 11, version 24H2, you might experience issues discovering USB connected devices that support the eSCL scan protocol.

I've taught my mom how to use Windows Fax and Scan, so any new software would have to be not only good, but good enough to justify abandoning the old software, which is really not bad.