When Microsoft found that some devices were not ready for Windows 10 version 2004, it moved them to a compatibility level. This is usually done to preserve the user experience.
However, avoiding Microsoft’s compatibility lock isn’t always a guarantee that a device won’t have compatibility issues with the Windows 10 May 2020 update. It’s a harsh reality that some users have to accept after the operating system has caused sound problems on their computers.
Complications with sound in Windows 10 2004 date back to a pre-release version of the operating system. A few months ago, a Windows insider said on Reddit that his system lost sound after upgrading to the beta version of Windows 10 2004. Now the affected machines had to be compatible with Windows 10 version 2004, so Microsoft offered them iOS first.