Windows Codex IDE sandbox exec fails before PowerShell starts: spawn setup refresh #26416

Title:
Windows Codex IDE sandbox exec fails before PowerShell starts: spawn setup refresh

Environment:

• OS: Windows
• IDE: VS Code
• Extension: Codex / openai.chatgpt
• Workspace: reproduced in existing repo and brand-new folder
• Shell attempted by Codex:
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -Command whoami

Issue:
Sandboxed exec_command fails before PowerShell starts.

Error:
CreateProcess { message: "Rejected("Failed to create unified exec process: spawn setup refresh")" }

Observed:

• Sandboxed whoami fails with the error above
• Sandboxed Get-Location fails the same way
• Escalated whoami works and returns dougpersonal\dougm
• Escalated git/version/location checks work
• No PowerShell output is produced, so failure appears to occur in Codex sandbox/unified exec setup before process launch

Tried:

• Reloaded IDE window
• Restarted machine
• Logged out/in to Codex
• Uninstalled/reinstalled Codex extension
• Tested in brand-new folder outside repo/OneDrive
• Edited/reset sandbox config; Codex prompted to set up clean sandbox and reported success
• Failure persisted