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TBS_E_PPI_FUNCTION_UNSUPPORTED
PPI availability does not imply every operation is supported
TBS_E_PPI_FUNCTION_UNSUPPORTED means Windows reached the firmware Physical Presence Interface but the specific requested method is not implemented. PPI operations are numbered firmware requests for actions such as enable, disable, clear, and changes to whether confirmation is required.
This differs from a completely unavailable PPI. A platform may support common operations while rejecting newer or vendor-specific ones. Updating application code to send a different number without understanding its semantics can request a destructive action.
What to verify
- Record the exact PPI operation number and compare it with the platform firmware's supported set.
- Check for system-firmware updates that explicitly add or correct PPI behavior.
- Use the Windows method that queries confirmation requirements and required transition before scheduling the request.
- Do not substitute a TPM clear for an unsupported maintenance operation unless the vendor procedure requires it.
References
- Microsoft: physical-presence request operations
- Microsoft: Tbsi_Physical_Presence_Command
- TCG TPM 2.0 Library specification
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