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E_SYNCENGINE_CLIENT_UPDATE_NEEDED
The scope of E_SYNCENGINE_CLIENT_UPDATE_NEEDED is Windows cloud-file and sync-engine infrastructure: the installed sync client is too old for the required service or protocol contract. Preserve 0x8802D006 beside the returning call before cleanup or retry creates a more generic secondary failure.
Read the condition first
A version gate is not ordinary network failure. The service or local metadata requires capabilities unavailable in the current client build, and repeated retries cannot add them.
Keep neighboring conditions separate
UNKNOWN_SERVICE_ERROR lacks classification; CLIENT_UPDATE_NEEDED explicitly identifies a compatibility gate.
Do not download arbitrary binaries or modify version checks.
Incident record
- Client build and channel.
- Minimum required version.
- Service/API version.
- Update policy and deployment state.
Reproduce without destroying evidence
The investigation should change one variable at a time and keep the original failing sample.
- First: Verify the signed supported update source.
- Next: Complete update and restart the client generation.
- Then: Preserve queued local changes.
- Finally: Confirm rollback policy will not restore the old binary.
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 client build and channel and remove only unrelated work.
- Targeted corrective control: Use this as a diagnostic branch rather than a blanket workaround: verify the signed supported update source. Hold constant: keep the original failing sample available for the final regression test.
Definition of done
Closure requires the supported client resumes queued work and remains compatible after restart and policy refresh; 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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