What does HRESULT 0x80280098 (TPM_20_E_SELECTOR) mean?

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A TPM 2.0 union selector does not match a valid union member.

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TPM_20_E_TAG	TPM_20_E_INSUFFICIENT

TPM_20_E_SELECTOR

TPM_20_E_SELECTOR maps to TPM_RC_SELECTOR. TPM structures often use a selector such as an algorithm or object type to choose a member of a union. The selector in this request was not valid for that union, so the TPM cannot interpret the following member as intended.

How to avoid a false fix

Validate the selector before serializing the union and build only the member defined for that selector.
Check that the selector is supported by this TPM; a known selector can still be unavailable in a device capability set.
Distinguish this from TPM_20_E_TYPE, which concerns an inappropriate value type, and from TPM_20_E_SCHEME, which concerns an incompatible cryptographic scheme.

TCG TPM 2.0 Part 2: union types and TPM_RC_SELECTOR · tpm2_getcap algorithms

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