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ERROR_NONE_MAPPED
ERROR_NONE_MAPPED (1332, 0x00000534) means that Windows could not map an account name to a SID or a SID to an account name. It does not automatically prove that the SID or account data is malformed.
Common meanings
LookupAccountName and LookupAccountSid search well-known SIDs, local accounts, the primary domain, and relevant trusted domains. A lookup can fail because the account no longer exists, the machine cannot contact the necessary domain service, or the SID intentionally has no account name, such as a logon-session SID.
Useful diagnostics
- Log the original account string or SID in a stable form before converting it.
- Check the lookup target computer and the domain qualification of an account name.
- Distinguish a missing mapping from a malformed SID by validating the SID separately.
- When displaying ACLs, preserve an unmapped SID rather than dropping the access-control entry; the SID may still be meaningful even without a friendly account name.
See Microsoft documentation for LookupAccountSid and LookupAccountName.
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