What does HRESULT 0x80290418 (TPM_E_KEY_NOT_AUTHENTICATED) mean?

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The TPM key is not authenticated.

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TPM_E_SOFT_KEY_ERROR	TPM_E_PCP_KEY_NOT_AIK

TPM_E_KEY_NOT_AUTHENTICATED

TPM_E_KEY_NOT_AUTHENTICATED means a TPM-backed key exists but has not completed the authorization required for the requested operation.

Check that the correct user, service, PIN, or authorization policy is present in the execution context.
Investigate the first authorization failure before retrying, because repeated invalid attempts may trigger lockout protection.
For background services, verify that the service account can access the intended machine key and that user-context keys are not being used accidentally.