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E_SYNCENGINE_UNSUPPORTED_MARKET
Within Windows cloud-file and sync-engine infrastructure, E_SYNCENGINE_UNSUPPORTED_MARKET reports that the sync service is unavailable for the current market or account region. Diagnosis of E_SYNCENGINE_UNSUPPORTED_MARKET should follow the original owner and generation rather than treating the visible symptom as the cause.
Mechanism behind the code
During a E_SYNCENGINE_UNSUPPORTED_MARKET investigation, 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. For E_SYNCENGINE_UNSUPPORTED_MARKET, 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.
For E_SYNCENGINE_UNSUPPORTED_MARKET, availability may be determined by account tenant, service rollout, legal region, SKU or endpoint configuration rather than the machine locale alone.
For E_SYNCENGINE_UNSUPPORTED_MARKET, 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.
High-value telemetry
| Capture | Diagnostic value |
|---|---|
| Account tenant and service region for E_SYNCENGINE_UNSUPPORTED_MARKET. | For E_SYNCENGINE_UNSUPPORTED_MARKET, this places the failure on the lifecycle or transaction timeline and helps test the Windows cloud-file and sync-engine infrastructure boundary. |
| Configured endpoint for E_SYNCENGINE_UNSUPPORTED_MARKET. | For E_SYNCENGINE_UNSUPPORTED_MARKET, this separates caller input from environment and service state and helps test the Windows cloud-file and sync-engine infrastructure boundary. |
| Client market/locale inputs for E_SYNCENGINE_UNSUPPORTED_MARKET. | For E_SYNCENGINE_UNSUPPORTED_MARKET, this provides a stable comparison across retries or another machine and helps test the Windows cloud-file and sync-engine infrastructure boundary. |
| Service entitlement response for E_SYNCENGINE_UNSUPPORTED_MARKET. | For E_SYNCENGINE_UNSUPPORTED_MARKET, this identifies the exact object or resource generation involved and helps test the Windows cloud-file and sync-engine infrastructure boundary. |
Decision table
- Second supported path for the same stable item: For
E_SYNCENGINE_UNSUPPORTED_MARKET, a changed result separates retained object, connection, path, host, or device state from the original input. Hold constant: For E_SYNCENGINE_UNSUPPORTED_MARKET, keep account, remote item version, and client build fixed. - Reduced failing operation: If
E_SYNCENGINE_UNSUPPORTED_MARKETfollows the reduced step, the rejecting transition is localized. Hold constant: For E_SYNCENGINE_UNSUPPORTED_MARKET, retain account tenant and service region and remove only unrelated work. - Targeted corrective control: Use this as a diagnostic branch rather than a blanket workaround: use the account’s authoritative region. Hold constant: For E_SYNCENGINE_UNSUPPORTED_MARKET, keep the original E_SYNCENGINE_UNSUPPORTED_MARKET sample available for the final regression test.
Safe reduction procedure
When E_SYNCENGINE_UNSUPPORTED_MARKET is returned, use a disposable control object, repository copy, file, or device association where the subsystem permits it.
- First: Use the account’s authoritative region.
- Next: Check service/SKU availability.
- Then: Avoid overriding locale as a proxy for entitlement.
- Finally: Surface a non-retryable regional limitation clearly.
Do not erase the distinction
During a E_SYNCENGINE_UNSUPPORTED_MARKET investigation, STORAGE_SERVICE_BLOCKED is an account restriction; UNSUPPORTED_MARKET is service availability by region/market.
For E_SYNCENGINE_UNSUPPORTED_MARKET, do not use VPN or locale changes to bypass service policy.
Successful outcome
Verify E_SYNCENGINE_UNSUPPORTED_MARKET with the original scenario, one boundary case, and one deliberate failure; success means supported accounts reach the correct regional endpoint and unsupported accounts fail without retry storms.
Technical references
The references below define the API family or storage/protocol behavior used to interpret E_SYNCENGINE_UNSUPPORTED_MARKET.
- For
E_SYNCENGINE_UNSUPPORTED_MARKET: 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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