What does HRESULT 0x80094812 (CERTSRV_E_SUBJECT_EMAIL_REQUIRED) mean?

CERTSRV_E_SUBJECT_EMAIL_REQUIRED

The important part of CERTSRV_E_SUBJECT_EMAIL_REQUIRED is its scope: template subject-name construction. The template requires an email value in the Subject or Subject Alternative Name, but the CA cannot obtain an eligible address from the request or directory account. Keep the hexadecimal value 0x80094812 with the returning API, because higher-level software may translate it into a message that loses this distinction.

Read the failure at the correct layer

In the path, template-driven enrollment depends on Active Directory data visible to both the client and CA. A template can exist yet be unpublished, replicated inconsistently, inaccessible, or unable to derive a required subject value from the requester in a template subject-name construction investigation. Record the directory object and the CA’s actual view.

Build an incident record

1. 1. Template object DN, OID, version, publication on the target CA, and replication state
   Check the template subject-name flags and whether the CA builds the subject from Active Directory.
2. 2. Requester identity and directory attributes used for subject or SAN construction
   Inspect the enrollee mail attribute and the actual SAN extension/request attributes.
3. 3. CA policy module events and the encoded template information in the request
   Avoid inserting an unverified arbitrary address when the template expects directory-sourced identity.

For template subject-name construction, these observations are deliberately nonsecret: identifiers, lengths, provider names, policy selections, and state transitions usually support comparison without recording private keys, passwords, PINs, or plaintext.

What to include in an escalation package

CA decisions depend on directory and transaction state at a particular moment. Correlate template modification and publication, Active Directory replication, request submission, request ID assignment, policy-module evaluation, disposition changes, and any client continuation. This is especially important when a retry reaches a different domain controller or creates a new CA database row in a template subject-name construction investigation.

• exported request and relevant attributes, template OID/version, CA configuration, and original request ID.
• CA operational events and request disposition history from the same transaction.
• In the path, directory evidence showing the template and requester attributes as visible to the CA at evaluation time.

Use two comparison axes

Query the same domain controller or directory view used by the CA, then enroll a known account with complete required attributes., compare the resulting request with the failing identity or template publication state.

1. Preserve the original input, identity, provider or protocol selection, and first return Value.
2. Use one known-good control that changes only the suspected part of the template subject-name construction path.
3. reverse the comparison with known-good input on the failing layer where that can be done safely.
4. Record where behavior first diverges in the template subject-name construction path instead of judging only by the final application message.

Do not collapse it into a neighboring code

This is a missing identity attribute, not an SMTP delivery or mail-server problem., typing a value into the request may not help when the template is configured to build the subject from directory data and reject supplied values.

For template subject-name construction, keep the original request and response pair; regenerating a key or submitting a new request may succeed while bypassing the policy or transaction state that produced this HRESULT.

Verification after the change

The target CA must resolve the intended template and derive or accept the required identity data according to that template, without substituting another template. Keep a regression case that uses nonsecret identifiers and expected outcomes, including one negative control that must continue to fail.

Technical references

These sources define the HRESULT and the relevant template subject-name construction interface, protocol, or data format.

• Microsoft Open Specifications: HRESULT values.
• Microsoft Open Specifications: Windows Client Certificate Enrollment.
• Microsoft: Certificate templates overview.
• Microsoft: certreq command.

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