AD FS – Fixing error message: None of the UPNs were successful for S4U Logon call
Read OriginalThis technical article provides a detailed investigation and solution for the AD FS error 'None of the UPNs were successful for S4U Logon call' that occurs during extranet authentication via Web Application Proxy. It explains the scenario, analyzes event log errors, identifies the root cause (the AD FS service account being in the 'Protected Users Security Group'), and provides the fix to resolve the authentication failure.
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