[Windows] Voice input incorrectly says another application is using the microphone

Description

Voice input in the Codex/ChatGPT Windows desktop app consistently shows: “Close other applications using the microphone” (Russian UI: “Закройте другие приложения, использующие микрофон”), even when no other application is using it.

Environment

• Windows desktop app package: OpenAI.Codex
• App version: 26.727.6591.0 (x64)
• Audio device: Microphone Array (Realtek(R) Audio)
• UI language: Russian

Steps to reproduce

1. Open Codex on Windows.
2. Open a task and select the microphone/voice input button.
3. The error appears immediately.

Expected behavior

Codex should start recording from the default microphone.

Actual behavior

Codex starts its audio service process but Windows never registers an active microphone capture, and the app displays the misleading “other applications” error.

Diagnostics already completed

• Confirmed no Discord, Telegram, Zoom, OBS, browser, or other communication app was using the microphone.
• Windows microphone access is enabled globally and explicitly allowed for OpenAI.Codex.
• Internal Chromium media_stream_mic settings contain no blocked permission.
• Realtek microphone endpoint reports Status OK and device problem code 0.
• Realtek was set as the default input for Console, Multimedia, and Communications roles.
• Restarted the Codex audio service and Windows app.
• Closed the hidden voice/avatar overlay.
• Re-registered the AppX package.
• Fully reset the OpenAI.Codex AppX package.
• The problem persists after all steps.

No application logs are attached to avoid sharing private session data.