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WU_E_AU_LEGACYCLIENTDISABLED
WU_E_AU_LEGACYCLIENTDISABLED means the old Automatic Updates client path was disabled. It normally indicates a legacy client configuration or support-boundary issue rather than a transient failure.
Practical response
- Identify the operating system and agent generation before applying any workaround.
- Use supported Windows servicing or a compatible management client instead of re-enabling an obsolete update mechanism.
- If the device is under central management, check whether the policy intentionally disables the old client path.
Microsoft: update Windows Update Agent to latest version
Microsoft: updating the Windows Update Agent
Microsoft: Windows Update error reference
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