Codex Desktop on Windows 10 cannot send the first message in a newly created project (workspace_dependencies unsupported)

What version of the Codex App are you using (From “About Codex” dialog)?

Codex Desktop 26.422.62136

Windows Store package observed locally:
OpenAI.Codex_26.422.8496.0_x64__2p2nqsd0c76g0

What subscription do you have?

ChatGPT Plus

What platform is your computer?

Windows 10 Pro
OS version observed locally: 10.0.19042

What issue are you seeing?

In the Codex Desktop app on Windows 10, I can create a new project and enter the project normally, but the first message in that new project cannot be sent successfully.

The composer accepts input, but after I try to send the first message, the project thread becomes stuck and does not proceed normally.

This appears to happen specifically in newly created projects / project-mode threads.

What steps can reproduce the bug?

1. Open Codex Desktop on Windows 10.
2. Create a new project.
3. Enter the project.
4. Type a message in the composer.
5. Send the first message.

What is the expected behavior?

The first message in the new project should send normally and the conversation should begin.

Additional information

Actual behavior

The project thread gets stuck on the first send and does not proceed normally.

Relevant local log path:

C:\Users\Administrator\AppData\Local\Codex\Logs\2026\04\29\codex-desktop-5d9f196d-ec1b-4846-88ed-16d6e088090d-19680-t0-i1-074609-0.log

Key error observed:

Primary runtime install failed before first turn
Codex Workspace dependencies are not supported on Windows 10.

Also observed in the same log session:

• Received turn/started for unknown conversation
• worker errors with ERR_INVALID_URL

Additional notes:

• This does not look like a project path problem.
• I also tried adding the following to C:\Users\Administrator\.codex\config.toml:

[features]
workspace_dependencies = false

but the issue still reproduced after restarting the app.

• Based on local investigation, this looks like a Windows 10 compatibility issue in project-mode first-turn initialization, likely related to workspace_dependencies.

Potentially related issues:

• #19437
• #19811