Codex Extension issue in VS Code

Finally find a way to make it work. Here is what I’ve done:

1. Close VSCode and Codex APP, and kill all codex related threads in Windows task manager.
2. remove the .codex folder in your User Folder.
3. IMPORTANT: Start Codex APP and login again. It will re-create the .codex folder. DO NOT start VSCode.
4. Start VSCode, then it works.

Original Post: Still have this issue in Windows 11. Tried everything, nothing works unless downgrade to the version last week. But I want to use GPT 5.5.

These are outputs in Codex channel: 2026-04-29 10:24:46.376 [info] Activating Codex extension

2026-04-29 10:24:46.376 [info] [CodexMcpConnection] Spawning codex app-server

2026-04-29 10:24:46.376 [error] [CodexMcpConnection] Codex process fatal error errorMessage=“Codex process errored: Failed to start Codex process: spawn UNKNOWN” exitCode=null signal=null

2026-04-29 10:24:46.376 [error] spawn UNKNOWN

2026-04-29 10:24:46.376 [error] [CodexWebviewProvider] Fatal error message=“Codex process errored: Failed to start Codex process: spawn UNKNOWN”

2026-04-29 10:24:46.376 [warning] [CodexMcpConnection] Attempted to send app-server message but stdin is destroyed message={“id”:“codex.chatSessionProvider:0”,“method”:“thread/list”,“params”:{“limit”:50,“cursor”:null,“sortKey”:“created_at”,“modelProviders”:null,“archived”:false,“sourceKinds”:[]}}

2026-04-29 10:24:46.377 [error] [CodexMcpConnection] Codex process fatal error errorMessage=“Codex process errored: Codex process is not available” exitCode=null signal=null

2026-04-29 10:24:46.377 [error] [CodexWebviewProvider] Fatal error message=“Codex process errored: Codex process is not available”

2026-04-29 10:24:46.377 [warning] [IpcClient] Received broadcast but no handler is configured method=thread-stream-state-changed

2026-04-29 10:24:46.377 [warning] [IpcClient] Received broadcast but no handler is configured method=client-status-changed

2026-04-29 10:24:46.377 [warning] [IpcClient] Received broadcast but no handler is configured method=thread-stream-state-changed

2026-04-29 10:24:46.788 [info] [wsl] eligible distro list listResult=“docker-desktop-data\ndocker-desktop”

2026-04-29 10:24:46.793 [warning] [CodexMcpConnection] Attempted to send app-server message but stdin is destroyed message={“id”:“CodexWebviewProvider.webview:5627e812-4df7-4386-98e1-e54346bfb364”,“method”:“account/read”,“params”:{“refreshToken”:false}}

2026-04-29 10:24:46.793 [error] [CodexMcpConnection] Codex process fatal error errorMessage=“Codex process errored: Codex process is not available” exitCode=null signal=null

2026-04-29 10:24:46.793 [error] [CodexWebviewProvider] Fatal error message=“Codex process errored: Codex process is not available”

2026-04-29 10:24:46.797 [warning] [CodexMcpConnection] Attempted to send app-server message but stdin is destroyed message={“id”:“CodexWebviewProvider.webview:7d24702e-c064-4b51-a5c3-4aab6e280d89”,“method”:“thread/list”,“params”:{“limit”:50,“cursor”:null,“sortKey”:“updated_at”,“modelProviders”:null,“archived”:false,“sourceKinds”:[]}}

2026-04-29 10:24:46.798 [error] [CodexMcpConnection] Codex process fatal error errorMessage=“Codex process errored: Codex process is not available” exitCode=null signal=null

2026-04-29 10:24:46.798 [error] [CodexWebviewProvider] Fatal error message=“Codex process errored: Codex process is not available”