Codex Desktop App — “failed to resume task” on all sessions after service incident #14396

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

26.305.950 (863)

What subscription do you have?

ChatGPT Enterprise

What platform is your computer?

Darwin 24.6.0 arm64 arm

What issue are you seeing?

Codex Desktop App Version 26.305.950 (863) on macOS 15.7.4 fails to start or load any session with the error:

failed to resume task

This affects:
• All existing sessions
• Any brand-new session created after reinstall

The error appears immediately when attempting to start or load a session.

ChatGPT (web) and Codex online function normally under the same account.

No meaningful local log entries are generated at the time of failure.

What steps can reproduce the bug?

1. Install Codex Desktop App 26.305.950 (863) on macOS 15.7.4.
2. Sign in using any OAuth provider (Microsoft, Google, Apple all tested).
3. Launch the app.
4. Attempt to:

• Open an existing session, or
• Create a new session.

5. The app immediately returns:

failed to resume task

This occurs even after:

• Full uninstall
• Manual removal of:

~/Library/Application Support/Codex
~/Library/Caches/Codex
~/Library/Preferences/com.openai.codex.plist
~/Library/Saved Application State/com.openai.codex.savedState

• Reboot
• Fresh reinstall
• Full OAuth reauthentication

After reinstall, previous sessions repopulate from the server immediately.

The failure appears to occur during backend session bootstrap, before local execution begins.

Session ID not available because new sessions fail before creation completes.

What is the expected behavior?

• Existing sessions should load normally.
• New sessions should create a fresh task/thread.
• If resume metadata is invalid, the app should fall back to creating a new task instead of failing entirely.

Additional information

• There was a recently reported Codex service incident marked as resolved.
• The issue began during or after that incident.
• ChatGPT (web) and Codex online are fully functional.
• The issue appears isolated to the Codex Desktop App namespace.
• Old sessions sync from server even after a full local wipe, suggesting server-side session metadata persists.
• The failure happens immediately (no prolonged spinner).