It's a driver-dependent feature and not a Window's Gr. policy settings. Ensure the audio driver installed supports Stereo Mix.
How to enable Stereo Mix by GPO
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Steve Vickroy
1
Reputation point
Is there a way to enable the Stereo Mix as a Microphone through a GPO?
Windows for business | Windows for IoT
1 answer
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S.Sengupta 28,651 Reputation points MVP Volunteer Moderator2026-01-21T04:20:00.16+00:00