ADB stopped working after installing Windows 11 23H2

I've been using ADB from the command prompt on this Microsoft Surface Book 3 laptop with success for about a year. It upgraded to Windows 11 23H2 from 22H2 a couple of weeks ago, and since then, ADB can't see any devices. I've rebooted laptop and devices, tried two different cables, and updated ADB. I now have: > adb --version Android Debug Bridge version 1.0.41 Version 35.0.1-11580240 Installed as C:\android\platform-tools\adb.exe Running on Windows 10.0.22631 > adb devices List of devices attached It does not sound a tone when an Android device is connected, which it used to do. I'd never needed to install special USB drivers on Windows 10 or 11, so I have not tried that. The devices do not show up in Windows Explorer. What am I missing?