Windows app spellcheck underlines misspellings but shows "No Guesses Found"

What happened?

In the Codex desktop app on Windows, the composer appears to detect misspelled words and shows red spellcheck underlines, but right-clicking the misspelled word opens a spelling context menu with No Guesses Found instead of correction suggestions.

This appears isolated to the Codex app. The same misspelling in a browser input shows normal spelling suggestions.

Steps to reproduce

1. Open the Codex desktop app on Windows.
2. Type a sentence in the composer with an intentionally misspelled word, for example helpsp or see in the wrong context.
3. Confirm the word receives a red spellcheck underline.
4. Right-click the underlined word.

Expected behavior

The context menu should show spelling suggestions, similar to Chromium/browser spellcheck. For example, helpsp should suggest something like helps.

Actual behavior

The context menu shows No Guesses Found. It still shows spelling-related actions such as Learn Spelling, which suggests the app recognizes the word as misspelled but cannot retrieve suggestions.

Environment

• Codex app: Windows Store package OpenAI.Codex_26.623.9142.0_x64__2p2nqsd0c76g0
• OS: Windows 10 Enterprise, WindowsVersion 2009
• Language: English (United States)
• Language features: Language pack installed, Basic typing installed
• Keyboard: US QWERTY

Troubleshooting already tried

• Rebooted Windows.
• Confirmed English (United States) language pack and Basic typing are installed.
• Confirmed browser spellcheck suggestions work for the same typo.
• The Codex app still underlines misspellings, but the suggestions menu remains empty.

Notes

This may be a Codex desktop/Electron spellcheck suggestion-provider issue rather than a Windows dictionary configuration problem, because system/browser spellcheck suggestions are available outside Codex.