HRESULT 0x80090369 (SEC_E_INVALID_UPN_NAME): meaning and diagnosis

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You can't sign in with a user ID in this format. Try using your email address instead.

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SEC_E_APPLICATION_PROTOCOL_MISMATCH	CRYPT_E_MSG_ERROR

SEC_E_INVALID_UPN_NAME

The important part of SEC_E_INVALID_UPN_NAME is its scope: user principal name syntax or resolution. The identity string is not acceptable in the UPN form expected by the authentication path, often because the suffix, separator, normalization, or directory value is wrong. Keep the hexadecimal value 0x80090369 with the returning API, because higher-level software may translate it into a message that loses this distinction.

Start with the returning API

Mutual authentication and UPN handling depend on the identity string passed to SSPI, how it maps to an account or SPN, and what the peer can prove when SEC_E_INVALID_UPN_NAME is returned. In the SEC_E_INVALID_UPN_NAME path, preserve the original target or user name, package selection, DNS and directory resolution, certificate or ticket identity, and canonicalized form.

Diagnostic evidence matrix

1. Exact target name or UPN before and after application normalization
Capture the exact Unicode identity supplied before UI or library normalization.
2. Selected package, SPN or certificate identity, realm or suffix, and directory lookup result
Compare user@dns-suffix form with the account userPrincipalName attribute and accepted UPN suffixes.
3. Channel bindings and the endpoint actually reached over the network
Avoid substituting an email address merely because it looks similar; verify the directory sign-in identifier.

For user principal name syntax or resolution, 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.

Correlate the failure with state changes

In the SEC_E_INVALID_UPN_NAME path, authentication failures are multi-leg transactions. For SEC_E_INVALID_UPN_NAME, align client SSPI calls, DNS and target-name resolution, policy refresh, domain-controller or KDC events, ticket acquisition, server acceptance, and any proxy or TLS transition. For SEC_E_INVALID_UPN_NAME, a single application timestamp is not enough to tell whether the decision was local policy, peer identity, context state, or KDC behavior.

Package and target name, requested and returned context attributes, and each SSPI return in order when SEC_E_INVALID_UPN_NAME is returned.
In the SEC_E_INVALID_UPN_NAME path, relevant Group Policy result, SPN or UPN resolution, contacted DC/KDC, and ticket or certificate identities.
One permitted control target and one deliberately rejected target evaluated with the same client build in an user principal name syntax or resolution investigation.

Minimal test sequence

For SEC_E_INVALID_UPN_NAME, use a known valid UPN or SPN for the same account or server, then alter only the naming form. For server identity, compare the requested name with ticket or certificate identity and the endpoint address instead of bypassing mutual authentication when SEC_E_INVALID_UPN_NAME is returned.

Test	Interpretation
Same input, known-good path	For user principal name syntax or resolution, success moves attention toward the selected provider, policy, device, context, or transaction state.
Known-good input, failing path	For user principal name syntax or resolution, failure suggests that the environment or selected object is independently unable to perform the operation.
Original path after one isolated change	For user principal name syntax or resolution, this comparison demonstrates whether the proposed correction addresses the original condition.

Boundaries of this HRESULT

A syntactically valid UPN can still fail authentication later. This code points to identity representation before credential validation. Disabling identity verification can convert a useful mismatch into a connection to the wrong server in an user principal name syntax or resolution investigation. For SEC_E_INVALID_UPN_NAME, correct naming and service registration rather than treating the check as cosmetic.

For user principal name syntax or resolution, also retain the original numeric value; neighboring constants can encode materially different remediation paths even when an application presents all of them as an authentication, certificate, or security failure.

Closure criteria

The requested identity, resolved directory object, authenticated peer, and network endpoint must agree; success under an IP address or alternate account is only a comparison when SEC_E_INVALID_UPN_NAME is returned. For SEC_E_INVALID_UPN_NAME, keep a regression case that uses nonsecret identifiers and expected outcomes, including one negative control that must continue to fail.

Technical references

For SEC_E_INVALID_UPN_NAME, these sources define the HRESULT and the relevant user principal name syntax or resolution interface, protocol, or data format.

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