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STATUS_PCP_TICKET_MISSING
The operation is missing a TPM ticket from its required evidence chain
STATUS_PCP_TICKET_MISSING means PCP expected a TPM ticket required to use the key, but the caller did not provide it. TPM tickets are validated artifacts created by prior TPM processing; they are not arbitrary application tokens and cannot safely be fabricated or substituted from another key flow.
This status points to a missing step or lost state in a multi-stage protocol. It is especially useful to trace the boundary between the component that obtains evidence and the one that later asks PCP to perform the protected operation.
What to check
- Capture the complete operation sequence and identify which earlier request is supposed to yield the required ticket.
- Keep tickets associated with the correct key, policy, TPM, and relevant session; do not cache them globally without understanding their validity scope.
- If a process restart loses the ticket, use the documented protocol to regenerate it rather than replaying stale binary data.
References
- Microsoft: PCP and TPM error codes
- Trusted Computing Group: TPM 2.0 Library Specification
- Microsoft: CNG Key Storage Providers
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