If you see Failed to play test tone error while testing your speaker or headphone, you can fix it by restarting Windows Audio Services, etc.

It also doesn't make any sense having a sound at startup to set your speaker levels by because there's no such thing as normalization for sounds within Windows.

Test tone in Windows is used to check the balance between the left and right speakers and or headphones on your PC. However, there have been reports from Windows 10 users getting “Failed to play ...