What does HRESULT 0x80091006 (CRYPT_E_AUTH_ATTR_MISSING) mean?

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CRYPT_E_AUTH_ATTR_MISSING: the cryptographic message does not contain an expected authenticated attribute.

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CRYPT_E_UNEXPECTED_ENCODING	CRYPT_E_HASH_VALUE

CRYPT_E_AUTH_ATTR_MISSING

The signed message lacks an authenticated attribute that the caller expected. This is a message-profile or verification-policy problem, not proof that every certificate in the chain is invalid.

What to check for CRYPT_E_AUTH_ATTR_MISSING

Identify the exact authenticated attribute required by the application or protocol.
Inspect the signer information and distinguish a missing attribute from an invalid signature or untrusted signer.
Make the sender produce the required signed attribute instead of accepting an unsigned substitute.

Microsoft: CryptVerifyMessageSignature

Microsoft: CryptMsgGetParam

Diagnostic discriminator: Inspect the authenticated-attribute set required by the message operation. This result is specifically a missing authenticated attribute, distinct from a bad signature or unsupported algorithm.

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