Your system seems to have a recent Bios update and Realtek driver.  Beyond that, uninstalling the sound device in the Device Manager and removing its drivers may help.  I have, in the past, needed to take a sound system all the way back to the basic Windows audio drivers. If you want a guess, I suppose the Realtek update may be the problem, but you can check the Device Manager and confirm which drivers the audio is currently using.  You do have other Realtek devices.
I updated my drivers to the latest (Windows Update) as I regularly do, without thinking too much, but now I have no sounds. Nothing plays on the speakers, in plugged-in headset nor in Airpods. Nothing. Other than "have you rebooted" or "try the sound issue utility", what should I do? It's one of those updates that caused the issue: [IMAGE] There are no issues under peripherals. I see nothing relevant under error logs.
XPS 15 9520 - Latest driver updates killed the sound