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ERROR_CLOUD_FILE_SYNC_ROOT_METADATA_CORRUPT
The platform cannot trust the registration data for this sync root
ERROR_CLOUD_FILE_SYNC_ROOT_METADATA_CORRUPT concerns the metadata that identifies and configures a Cloud Files API sync root, not the contents of one placeholder. A sync root is registered with provider identity and synchronization policies before a provider connects to it. If that registration state is damaged, Windows cannot reliably associate the directory with the expected provider or apply its hydration, population, in-sync, and hard-link policies.
Confirm that the path still points to the intended sync-root directory and that the provider identity used during registration has not changed unexpectedly. Provider repair code should unregister and register the root through supported APIs only after preserving any authoritative mapping needed to reconstruct placeholders. Reinstalling the provider executable alone may not repair platform registration state, while deleting arbitrary reparse data can destroy the identities needed for reconciliation.
What to inspect
- Query the registered root and compare its provider identity with the current account configuration.
- Check whether the failure affects the root itself before investigating individual placeholder metadata.
- Use the provider's supported reset or re-registration path rather than editing filesystem metadata directly.
References
- Microsoft: registering a Cloud Files sync root
- Microsoft: sync-root policies stored with registration
- Microsoft: connecting a registered sync root
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