Get Voicemeeter Banana https://www.vb-audio.com/Voicemeeter/banana.htm
set your audio device as the hardware output A1
then set the audio app/s to either Voicemeeter ASIO or Voicemeeter AUX ASIO
set hardware input 1 to Cable Output https://www.vb-audio.com/Cable/index.htm
right click on your Windows speaker icon in the system tray > playback devices, and set Cable Input as the default.
Set Voicemeeter to run at startup.