The only thing that worked was to reinstall Windows keeping nothing. The audio works now.
Sometime this November 2021 my audio stopped working but only in Windows 10. When I boot to Dell Diagnostics it passes the audio test and audio can be heard coming from speakers. When I boot to WinPE 10-8 Sergei Strelec I also hear audio coming from speakers. The device manager in Windows 10 shows the devices as working normally however the speaker icon near the notification area has a red X on it and hovering the mouse over it shows "No Audio Output Device is installed." I have uninstalled and reinstalled drivers and did an in place reinstall of Windows 10 21H2. The problem occurred on 21H1. It's happening on a Dell Inspiron 3541.
No Audio Output Device is installed.