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STATUS_CLOUD_FILE_AUTHENTICATION_FAILED
Authentication is provider-specific remote-service state. The Cloud Files platform manages local placeholders and callbacks, but a complete sync engine remains responsible for its own account session, token renewal, remote authorization flow, and conflict rules.
Do not change NTFS ACLs as a response to this code unless a separate local access failure is also present. Instead, identify the provider account and request that failed, refresh or reauthenticate through the provider's supported flow, and expose a useful root-level or file-level sync status to the user.
Useful checks
- Record the remote account context and request correlation without logging bearer tokens or secrets.
- Distinguish authentication failure from
STATUS_CLOUD_FILE_ACCESS_DENIED, which concerns local Cloud Files access. - Publish provider status so File Explorer can show an actionable explanation rather than a generic failure.
Relevant documentation
- Build a Cloud Sync Engine explains that the provider owns the complete sync behavior beyond placeholders.
- CfReportSyncStatus documents root-level status reporting for failed Cloud Files operations.
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