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E_SYNCENGINE_REQUEST_BLOCKED_DUE_TO_CLIENT_ERROR
E_SYNCENGINE_REQUEST_BLOCKED_DUE_TO_CLIENT_ERROR belongs to Windows cloud-file and sync-engine infrastructure. It marks the request was blocked because the client supplied invalid or inconsistent state. The useful starting point is the exact API, object and state transition that returned 0x8802C007, because a shell or application message can hide that boundary.
Where this result is raised
This classification points back to the client request, local metadata, protocol version, or sequencing rather than service capacity. Capturing the serialized request and local item generation is essential.
Evidence worth collecting
- Request method and validated fields.
- Client/version capability.
- Local item generation.
- Service validation details.
A controlled diagnostic sequence
- First: Validate required fields before send.
- Next: Compare with a minimal known-good request.
- Then: Regenerate stale metadata from authoritative identity.
- Finally: Upgrade only when the API contract requires it.
How to interpret comparison tests
| Control | Interpretation | Hold constant |
|---|---|---|
| Same stable item ID, second supported path | A change separates local file-system/provider state from remote service state. | Keep account, remote version and client build fixed. |
What this code does not justify
REQUEST_BLOCKED_BY_SERVICE can be server policy; DUE_TO_CLIENT_ERROR identifies the client request as the reason.
Do not retry the identical invalid request with backoff.
Verification after correction
Treat it as corrected only when the corrected request passes local validation and the old malformed shape remains covered by a negative test; retain the original negative case so fallback cannot be mistaken for repair.
Technical references
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