What does HRESULT 0x80091008 (CRYPT_E_INVALID_INDEX) mean?

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CRYPT_E_INVALID_INDEX: the index value is not valid.

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CRYPT_E_HASH_VALUE	CRYPT_E_ALREADY_DECRYPTED

CRYPT_E_INVALID_INDEX

The caller requested a signer, recipient, certificate, CRL, or attribute by an index that is no longer valid for the current message state.

Validate bounds against the count returned for the currently decoded message.
After deleting a signer, certificate, CRL, or unauthenticated attribute through CryptMsgControl, reacquire indices; Microsoft documents that existing indices can become invalid.
Do not reuse cached index values across a new message handle or a new decode operation.