Windows 11 mutes all audio devices if there is no active user session

Hi, for that kind of DSP service, I’d be careful assuming this is just a simple audio setting. Windows audio is heavily tied to the interactive user session, especially for endpoint devices. A background Windows service may keep running, but the audio endpoint can behave differently when no user is logged on. If AutoLogon is not acceptable, I’d test whether the service can run under a dedicated service account with the needed audio permissions, and also check with the audio driver vendor because some drivers intentionally disable output without an active session.