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CRYPT_E_NO_VERIFY_USAGE_DLL
No installed or registered function was available to verify the requested certificate subject usage. This affects policy validation rather than the basic ability to parse the certificate.
What to check for CRYPT_E_NO_VERIFY_USAGE_DLL
- Identify the usage or policy check requested by the application.
- Verify that the deployment includes the supported verification component for that certificate type and policy.
- Do not bypass EKU or usage validation without understanding why the verifier is unavailable.
Microsoft: CertVerifyCertificateChainPolicy
Microsoft: CertGetCertificateChain
Diagnostic discriminator: Check whether a registered subject-usage verification implementation can be resolved and loaded. The certificate may parse normally; the missing component is the usage-policy verification function.
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