What does HRESULT 0x8009100F (CRYPT_E_ATTRIBUTES_MISSING) mean?

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CRYPT_E_ATTRIBUTES_MISSING: the cryptographic message does not contain all of the requested attributes.

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CRYPT_E_SIGNER_NOT_FOUND	CRYPT_E_STREAM_MSG_NOT_READY

CRYPT_E_ATTRIBUTES_MISSING

The cryptographic message did not contain all attributes requested by the caller. This can happen when software expects optional CMS attributes to be present in every message.

What to check for CRYPT_E_ATTRIBUTES_MISSING

Identify which attribute was requested and whether the relevant profile actually mandates it.
Do not infer missing attributes from certificate properties; inspect the CMS signer or recipient information directly.
Handle optional attributes explicitly instead of treating their absence as a generic certificate error.

Microsoft: CryptMsgGetParam

Microsoft: CryptVerifyMessageSignature

Diagnostic discriminator: Inspect the requested CMS/CryptoAPI attribute set by OID or attribute identifier. This result means the requested attributes are absent, not that their encoded values are malformed.

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