Codex Desktop cannot launch direct bash -lc from Windows, but wsl.exe --cd works

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

26.506.31421

What subscription do you have?

Pro $200

What platform is your computer?

Microsoft Windows NT 10.0.22631.0 x64

What issue are you seeing?

Summary

Codex Desktop on Windows cannot launch direct bash -lc even from a normal Windows cwd, but launching Bash through wsl.exe --cd works.

Correlation id: d59c19ac-741f-4d5f-bcb5-7afaebb3b76d

Reproduction details

From a Codex Desktop Windows shell context:

Set-Location -LiteralPath $env:USERPROFILE
bash -lc 'echo ok'

Actual result

Access is denied.
Error code: Bash/Service/CreateInstance/E_ACCESSDENIED

This also occurs when the active workspace is a WSL UNC path, but changing PowerShell's cwd to $env:USERPROFILE first does not fix it.

Workaround that succeeds

wsl.exe -d Ubuntu --cd /home/ekane/src/github.com/sentrylink/webapp -- bash -lc 'echo ok'

Expected behavior

Direct bash -lc should work the same way it does in an interactive PowerShell session, or Codex should clearly document/surface that direct bash.exe launch is blocked and recommend the wsl.exe --cd ... -- bash -lc ... pattern.

Impact

For WSL checkouts, this makes shell-feature commands harder and increases quoting issues because commands must be routed through PowerShell -> wsl.exe -> Bash.