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STATUS_TPM_PPI_FUNCTION_UNSUPPORTED
PPI support is a platform-firmware capability
STATUS_TPM_PPI_FUNCTION_UNSUPPORTED indicates that the requested method is not supported by the platform Physical Presence Interface. It does not establish that the TPM hardware is defective, nor that Windows lacks a generic TPM command.
PPI is a contract between the operating system and platform firmware for sensitive TPM state changes. Firmware can expose a different revision or a limited operation set. The useful next step is to determine the requested PPI operation, the platform firmware version and the documented OEM workflow, rather than attempting to emulate the confirmation path in user mode.
What to establish before changing state
- Identify the exact PPI operation requested by the tool or deployment workflow.
- Check the firmware version and OEM documentation for supported TPM maintenance operations.
- Preserve recovery material before switching to a manual firmware path for clear or provisioning operations.
References
- TCG PC Client Physical Presence Interface
- Microsoft: Clear-Tpm cmdlet
- Microsoft: Initialize-Tpm cmdlet
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