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WU_E_NON_UI_MODE
WU_E_NON_UI_MODE means the caller asked Windows Update to show user interface while the client is running in a non-UI mode or the UI modules are not installed.
What to do
- Keep service and scheduled-task update flows fully unattended.
- Do not assume a remote or background session can display Windows Update dialogs.
- Use WUA APIs to report state programmatically and present any user messaging through the application’s own supported UI.
Microsoft: Windows Update Agent API
Microsoft: Using the Windows Update Agent API
Microsoft: WUA success and error codes
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