Codex Desktop Windows: connector OAuth "Open in Codex" opens Electron error instead of completing callback

[kerimala]

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

OpenAI.Codex_26.527.3378.0_x64__2p2nqsd0c76g0

What subscription do you have?

ChatGPT Pro ($200/month)

What platform is your computer?

Microsoft Windows NT 10.0.26200.0 x64 (Windows 11 Pro)

What issue are you seeing?

Codex Desktop on Windows fails to complete connector OAuth after browser login. When authenticating Codex connectors and clicking "Open in Codex" in the browser, Windows opens an Electron error dialog instead of returning the OAuth callback to the running Codex app.

This is a Codex Desktop/App protocol callback issue, not a Codex CLI issue.

Observed with:

• OpenAI Developer plugin connection
• Supabase connector connection
• Browser used for the login flow: Brave

Actual error dialog:

Error launching app

Unable to find Electron app at C:\Program
...\oauth_callback?code=[REDACTED]

Cannot find module 'C:\Program
...\oauth_callback?code=[REDACTED]'

Local investigation:

• The installed MSIX package is OpenAI.Codex_26.527.3378.0_x64__2p2nqsd0c76g0.
• AppxManifest.xml registers the codex protocol with executable app/Codex.exe.
• The Electron error text matches Electron's default app loader path for "Unable to find Electron app", suggesting the codex://...oauth_callback?... activation URL is being interpreted as an Electron app path / first positional argument before the packaged Codex app handles it.

What steps can reproduce the bug?

1. Open Codex Desktop on Windows.
2. Start connecting a connector or plugin that uses browser OAuth, such as the OpenAI Developer plugin or Supabase connector.
3. Complete the browser login flow.
4. Click "Open in Codex" in the browser.
5. Observe that an Electron "Error launching app" dialog opens instead of Codex completing the connector authentication.

What is the expected behavior?

Codex Desktop should receive the codex://...oauth_callback... protocol activation URL, route it to the running app, and complete connector authentication.

The OAuth callback URL should not be interpreted as an Electron application path.

Additional information

A redacted screenshot is attached showing the Electron dialog. The OAuth code= value has been fully redacted before sharing.

I searched existing openai/codex issues for the exact error text and related terms, including:

• Unable to find Electron app
• Error launching app
• oauth_callback
• Open in Codex

• codex://
• protocol handler
• Supabase connector OAuth
• OpenAI Developer connector OAuth

I found related Codex Desktop OAuth reports, but not this specific Windows protocol callback failure where the OAuth callback is treated as an Electron app path.

[GMarangoci]

I’m seeing the same issue.

Codex App version: 26.527.3686.0
Codex CLI version: 0.98.0
Subscription: ChatGPT Pro
Platform: Windows

Affected OAuth flows:

• Supabase MCP OAuth
• Google Drive OAuth
• GitHub OAuth, likely same error
• Possibly every plugin/connector that uses the Codex browser OAuth callback

Error after browser authorization:

Error launching app

Unable to find Electron app at C:\Program
...\oauth_callback?state=codex_scheme_oauth_s_...

Cannot find module 'C:\Program
...\oauth_callback?state=codex_scheme_oauth_s_...'

Troubleshooting tried:

• Repair Codex app
• Reset Codex app
• Uninstall/reinstall Codex
• Reboot Windows
• Attempted Appx re-registration
• Verified codex protocol registration exists for OpenAI.Codex MSIX package

Supabase workaround:
Supabase MCP works only when bypassing OAuth with a bearer token via SUPABASE_ACCESS_TOKEN. Google Drive still fails because OAuth is required.

This took substantial troubleshooting to isolate, and it blocks connecting any OAuth-based plugin/connector on Windows.

[Innerpeace1990]

I’m seeing the same connector OAuth callback failure on Windows, with OpenAI Developers / OpenAI Platform.

Environment:

• Codex App: OpenAI.Codex_26.527.3686.0_x64__2p2nqsd0c76g0
• Windows: Windows 10 Pro for Workstations, version 25H2, build 26200, 64-bit
• Default browser: Chrome (ChromeHTML)
• Plugin: openai-developers version 1.1.0
• Connector/app: OpenAI Platform (openai-platform)

What works:

• The OpenAI Developers plugin itself installs and is enabled.
• Its chat skills are visible/usable. For example, trying “Create an OpenAI API key to use in this project” starts the skill flow in chat.
• Google Drive connection works after reinstalling that plugin.

What fails:

• In the OpenAI Developers plugin page, clicking “Continue connecting app” for OpenAI Platform opens the browser authorization flow.
• After authorization, the callback fails with the Windows Electron dialog instead of returning to Codex.

Error dialog, with OAuth code redacted:

Error launching app

Unable to find Electron app at C:\Program
...\oauth_callback?code=[REDACTED]

Cannot find module 'C:\Program
...\oauth_callback?code=[REDACTED]'

Additional local check:

• The codex: protocol registration exists and points to the Codex MSIX AppX protocol handler (OpenAI.Codex_2p2nqsd0c76g0!App, ContractId=Windows.Protocol).
• Even after restarting Codex and retrying the OpenAI Platform connection, the same Electron callback error appears.

This looks like the plugin is installed correctly, but the OpenAI Platform connector OAuth callback is not being delivered back to the Codex Windows desktop app correctly.

[Innerpeace1990]

Correction to my previous environment details: I initially reported the Windows/AppX package versions from PowerShell, but the user-visible versions are different.

Correct user-visible versions:

• Codex About dialog: 26.527.31326
• Windows Settings page: Windows 11 Pro for Workstations, version 25H2, OS build 26200.8457

Additional note:

• PowerShell reports the installed AppX package as OpenAI.Codex_26.527.3686.0_x64__2p2nqsd0c76g0, which is why my earlier comment included 26.527.3686.0.
• PowerShell also reports WindowsProductName as “Windows 10 Pro for Workstations” while OsName reports “Microsoft Windows 11 专业工作站版”. The user-visible Windows Settings value is Windows 11 Pro for Workstations, so that should be treated as the correct environment label.

[dclamage]

I have the exact same issue with Codex about dialog 26.527.31326

Windows 11 Pro 25H2 26200.8457

[saroo98]

Same root cause here with the Figma connector / "Figma MCP in ChatGPT" OAuth flow on Windows, so this is not limited to GitHub/Supabase/OpenAI Platform.

Environment:

• Codex package: OpenAI.Codex_26.527.3686.0_x64__2p2nqsd0c76g0
• Windows x64, build 26200.8524

Repro:

1. Open Codex desktop app.
2. Start the Figma connection flow.
3. Browser opens the Figma consent page for "Figma MCP in ChatGPT".
4. Approve the authorization.
5. Browser shows that authorization is finishing and redirects to codex://oauth_callback?....
6. Codex shows the Electron error dialog instead of completing the connection.

Observed error:

Error launching app

Unable to find Electron app at C:\Program
...\oauth_callback?code=...&state=codex_scheme_oauth_...

Cannot find module 'C:\Program
...\oauth_callback?code=...&state=codex_scheme_oauth_...'

Additional note:

• Reset-AppxPackage did not resolve it.

This looks like the same Windows protocol/deep-link handling bug affecting another OAuth-based connector.