Play Audio on Two Devices in Windows 11 or Windows 10 {Output Audio to Multiple Devices}

Want to play Audio on two devices on Windows 10 or Windows 11 (Like both on System default speaker and headset)? You can do it easily!
Right click on the Sound icon on the taskbar - sound settings - scroll down to Advanced. Click on More Sound Settings - click on Recording tab. Right click on the blank space and enable show Disabled Devices. Right click on Stereo Mix and Enable it.
Double click the Streo mix to open it. Switch to the listen tab. Enable "listen to this device". Click on APPLY and ok.

Now Go to the desktop. Right click on the sound icon - open volume mixer - scroll down to the Apps. Select the app where the media is playing. Change the Output Device from Default to Speaker.
Scroll up and change the Output Device for System to Headphones/Headset.
Done! The Media will be playing both on your system speaker and headset

If it doesn't work, Go to More Sound settings as above and enable both Speaker and headset. And make Headset as your default.

If any unsettling sound is there, you can go to volume mixer and mute any of the stero mix volume (Try both, One will mute your headset/speaker)

All messed up? You can set to defaults or revert the changes!

Hope this helps!
Iviewgle