What does HRESULT 0x8802B005 (E_SYNCENGINE_FILE_SYNC_PARTNER_ERROR) mean?

E_SYNCENGINE_FILE_SYNC_PARTNER_ERROR

The scope of E_SYNCENGINE_FILE_SYNC_PARTNER_ERROR is Windows cloud-file and sync-engine infrastructure: a delegated sync partner failed while owning the file operation. Preserve 0x8802B005 beside the returning call before cleanup or retry creates a more generic secondary failure.

Read the boundary first

When E_SYNCENGINE_FILE_SYNC_PARTNER_ERROR is returned, a Windows sync engine coordinates local NTFS objects, provider metadata, remote identifiers, quota and naming rules, placeholder hydration, network authentication, and asynchronous upload or download state. During a E_SYNCENGINE_FILE_SYNC_PARTNER_ERROR investigation, the same Explorer action can cross several of those boundaries, so diagnosis must retain the first failing stage rather than treating every code as a generic connectivity problem.

During a E_SYNCENGINE_FILE_SYNC_PARTNER_ERROR investigation, the primary engine handed responsibility to another program or provider. For E_SYNCENGINE_FILE_SYNC_PARTNER_ERROR, the outer HRESULT identifies delegation, while the partner’s own status, version and correlation ID carry the actual cause.

For E_SYNCENGINE_FILE_SYNC_PARTNER_ERROR, the first owner to inspect is the local sync root, placeholder state, file-system operation, provider request, network exchange, account policy, or remote storage operation that produced the HRESULT.

Keep neighboring conditions separate

When E_SYNCENGINE_FILE_SYNC_PARTNER_ERROR is returned, UNKNOWN_SERVICE_ERROR belongs to the remote service path; PARTNER_ERROR identifies another local sync component.

For E_SYNCENGINE_FILE_SYNC_PARTNER_ERROR, do not troubleshoot only the primary engine or retry while two partners claim ownership.

Incident record for this HRESULT

Reproduce without destroying evidence

For E_SYNCENGINE_FILE_SYNC_PARTNER_ERROR, the investigation should change one variable at a time and keep the original failing sample.

1. First: Confirm which component owns the file.
2. Next: Capture the partner result before translation.
3. Then: Test the same file without delegation where supported.
4. Finally: Verify cleanup of incomplete handoffs.

Three useful controls

• Second supported path for the same stable item: For E_SYNCENGINE_FILE_SYNC_PARTNER_ERROR, a changed result separates retained object, connection, path, host, or device state from the original input. Hold constant: For E_SYNCENGINE_FILE_SYNC_PARTNER_ERROR, keep account, remote item version, and client build fixed.
• Reduced failing operation: If E_SYNCENGINE_FILE_SYNC_PARTNER_ERROR follows the reduced step, the rejecting transition is localized. Hold constant: For E_SYNCENGINE_FILE_SYNC_PARTNER_ERROR, retain partner identity and version and remove only unrelated work.
• Targeted corrective control: Use this as a diagnostic branch rather than a blanket workaround: confirm which component owns the file. Hold constant: For E_SYNCENGINE_FILE_SYNC_PARTNER_ERROR, keep the original E_SYNCENGINE_FILE_SYNC_PARTNER_ERROR sample available for the final regression test.

Definition of done

Closure for E_SYNCENGINE_FILE_SYNC_PARTNER_ERROR requires exactly one partner owns the operation and reports a traceable completion or failure; then repeat the next lifecycle operation to detect stale state.

Technical references

The references below define the API family or storage/protocol behavior used to interpret E_SYNCENGINE_FILE_SYNC_PARTNER_ERROR.

• For E_SYNCENGINE_FILE_SYNC_PARTNER_ERROR: Microsoft: Build a Cloud Files sync engine
• Microsoft: Cloud Filter API reference
• Microsoft: Determine cloud placeholder state
• Microsoft: Restrictions and limitations in OneDrive and SharePoint

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