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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 condition first
The primary engine handed responsibility to another program or provider. The outer HRESULT identifies delegation, while the partner’s own status, version and correlation ID carry the actual cause.
Keep neighboring conditions separate
UNKNOWN_SERVICE_ERROR belongs to the remote service path; PARTNER_ERROR identifies another local sync component.
Do not troubleshoot only the primary engine or retry while two partners claim ownership.
Incident record
- Partner identity and version.
- Delegated operation and file ID.
- Partner status and logs.
- Handoff and completion correlation IDs.
Reproduce without destroying evidence
The investigation should change one variable at a time and keep the original failing sample.
- First: Confirm which component owns the file.
- Next: Capture the partner result before translation.
- Then: Test the same file without delegation where supported.
- Finally: Verify cleanup of incomplete handoffs.
Three useful controls
- Second supported path for the same stable item: a changed result separates retained object, connection, path, host, or device state from the original input. Hold constant: keep account, remote item version, and client build fixed.
- Reduced failing operation: If this result follows the reduced step, the rejecting transition is localized. Hold constant: 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: keep the original failing sample available for the final regression test.
Definition of done
Closure 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 this result.
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