Codex installer fails when Microsoft Store services are disabled - direct MSIX install works

Codex
,
1

The official Windows Codex installer cannot install the app when Microsoft Store infrastructure is intentionally disabled. The Codex package itself
installs successfully when obtained directly and sideloaded, so this appears to be a distribution limitation rather than an application compatibility
problem.

Environment:

  • Windows x64, version 25H2
  • Build 26200.7171
  • Official Codex Store Installer version 22606.630.1.0
  • Microsoft Store Install Service intentionally disabled

Steps to reproduce:

  1. Disable the Microsoft Store installation backend.
  2. Download the official Codex Installer from OpenAI.
  3. Run the installer.

Actual result:
The installer displays a generic “Something went wrong and we’ll need to try again” message and attempts to redirect to Microsoft Store.

Windows Event Viewer shows:

  • Product ID: 9PLM9XGG6VKS
  • Package: OpenAI.Codex_26.707.3748.0_x64
  • Error: 0x80070422 — a required service is disabled

The documented command-line alternative does not help:

  winget install Codex -s msstore

It still uses the Microsoft Store source and therefore depends on Store infrastructure.

Working workaround:

  1. I recovered the exact Microsoft-hosted MSIX location from the AppX deployment event.

  2. Verified the package signature successfully. It was signed through Microsoft Marketplace.

  3. Installed it locally with:

    Add-AppxPackage -Path .\OpenAI.Codex_26.707.3748.0_x64__2p2nqsd0c76g0.msix

The installation completed successfully:

  • Package: OpenAI.Codex
  • Version: 26.707.3748.0
  • Architecture: x64
  • Package status: Ok

The previously disabled Store installation and update services remained disabled.

Requested improvements:

  1. Publish an official direct, signed MSIX or AppInstaller download.
  2. Document a Store-independent installation and update procedure.
  3. Make the installer report the underlying 0x80070422 error and explain which service is required instead of displaying a generic failure.

This would help developers and organizations using security-hardened, managed, privacy-focused, or Store-disabled Windows installations.

Screenshot of the installer failure attached.

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