Error message SPN028 appears when you add User Principal Name or check user against AD under SPNEGO transaction.
Netweaver AS ABAP 7.3 and higher
SAP NetWeaver 7.3 ; SAP NetWeaver 7.4 ; SAP NetWeaver 7.5
SPNEGO, SPN028, Active Directory, username, password, incorrect, User Principal Name , KBA , BC-SEC-LGN , Authentication , BC-IAM-SSO-SL , Secure Login , Problem
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