How to share Windows Media Player audio and microphone audio at the same time in Teams Live

A Teams Live producer needs to speak at the same time they play music in Windows Media Player.  Checking "share system audio" just plays the music and effectively mutes the microphone.  However, if the user shares audio from a browser, they can be heard speaking at the same time.

Any tips for successfully sharing Windows Media Player audio and microphone audio at the same time in Teams Live?