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ERROR_CLOUD_FILE_AUTHENTICATION_FAILED
The local placeholder is valid, but the provider cannot authenticate upstream
ERROR_CLOUD_FILE_AUTHENTICATION_FAILED is a provider-reported failure during a cloud operation. CFAPI manages the local placeholder and callback channel; the provider remains responsible for authenticating to its remote service. This status is therefore different from local ERROR_CLOUD_FILE_ACCESS_DENIED, which can result from filesystem access or sync-root ownership rules.
Inspect account-token acquisition, expiry, audience, tenant or account selection, and any interactive sign-in requirement. Correlate the failure with the provider callback and remote request rather than changing NTFS ACLs first. After credentials are refreshed, retry the original operation using the same placeholder identity and confirm that the provider does not map authorization, throttling, or network errors incorrectly to authentication failure.
What to inspect
- Record the remote authentication stage and sanitized service response.
- Verify the placeholder maps to the intended account and tenant.
- Separate token failure from local ACL, network, and provider-process failures.
References
- Microsoft: provider completion statuses for cloud operations
- Microsoft: local provider connection and access requirements
- Microsoft sample: provider-side implementation boundary
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