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STATUS_TPM_FAMILYCOUNT
STATUS_TPM_FAMILYCOUNT is a Windows NTSTATUS value in the TPM facility. For STATUS_TPM_FAMILYCOUNT, it belongs to the TPM 1.2 error family and is normally surfaced through the Windows TPM stack, such as TPM Base Services, rather than by ordinary file, registry or network APIs.
TPM 1.2 delegation uses family state and counters to manage delegated permissions. This status indicates that the family count carried by the caller does not match the TPM state.
The usual cause is stale delegation material. After owner actions, family invalidation or table changes, cached delegations may still look syntactically valid but fail the family-count consistency check.
Diagnostic focus
- Log the delegation family ID and count value used by the caller.
- Invalidate cached delegated credentials after owner or family-management operations.
- Do not diagnose this as a transport corruption unless fresh delegation state fails in the same way.
References for STATUS_TPM_FAMILYCOUNT
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