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WU_E_PT_REGISTRATION_NOT_SUPPORTED
WU_E_PT_REGISTRATION_NOT_SUPPORTED means the agent attempted a registration workflow against a service that is not supported for Windows Update registration. The code usually indicates a service-selection or endpoint configuration issue.
What to verify
- Confirm whether policy points the client to a supported WSUS service for managed update registration.
- Check that a reverse proxy or custom endpoint is not being used as though it were a full WSUS implementation.
- Review the configured update-service URLs and the first registration request in WindowsUpdate.log.
Microsoft: Troubleshoot WSUS client agents
Microsoft: Windows Update error reference
Microsoft: Windows Update log files
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