I checked my camera and microphone settings on my Brave Web browser. Nothing appeared to be wrong with the settings in those areas. I borrowed a family member's dedicated PC microphone to see if that solved the problem, but I still couldn't use YouTube voice search even with my YouTube and Google accounts logged in on both my Brave and Chrome browsers. I reset my default microphone settings back to my Logitech C922 webcam microphone on my Brave, Chrome, and Edge browsers and the C922 mic appeared to be working properly in my Windows 10 Sound settings, Skype, and Zoom. Could it be my NordVPN or Trend Micro Antivirus programs preventing YouTube voice search on my PC? I have the mobile versions of the mentioned programs on my Android smartphone, but I can still use YouTube voice search on my YouTube app on my smartphone. I am starting to suspect that it may be some kind of hardware compatibility issue because I have an older PC system. My desktop PC build is around 7 years old. If that is the case, then I am prepared for the possibility that I won't be able to use the YouTube voice search on my desktop PC until I get a new computer. I appreciate any additional advice or suggestions that you may have that might fix this problem.