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SEC_E_MULTIPLE_ACCOUNTS
SEC_E_MULTIPLE_ACCOUNTS signals this condition: A certificate used for authentication mapped to more than one account. Windows could not choose a single identity for the certificate. Multiple mappings can be deliberate in specialized designs, but the sign-in workflow must disambiguate them correctly.
What to check
- Inspect the certificate identity fields and all account mappings that reference the certificate.
- For smart-card sign-in, check whether the user-name hint policy is required for the intended scenario.
- Remove or change a mapping only after confirming which account the certificate should represent.
Microsoft: Smart-card certificate requirements
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