Often overlooked during the installation of a Microsoft SQL Server is the creating of the required Service Principal Name(s) (SPN) to enable authentication through Kerberos. SCOM highlights this oversight nicely with this warning:
SQL Server cannot authenticate using Kerberos because the Service Principal Name (SPN) is missing, misplaced, or duplicated.
Service Account: CONTOSO\s_clsql_sqlsrv_de
Missing SPNs: MSSQLSvc/CLSQL01.contoso.com:MSSQL, MSSQLSvc/CLSQL01.contoso.com:1433
The solution is simple: create the SPNs. All the info you need is actually in the alert's description. Use the information to create the SPNs.