Is the SPN (Service Principal Name) registered correctly
To create an SPN for the NetBIOS name of the SQL Server use the following command: setspn –A MSSQLSvc/<SQL Server computer name>:port# <Domain\Account>
To create an SPN for the FQDN of the SQL Server use the following command: setspn -A MSSQLSvc/<SQL Server FQDN>:port# <Domain\Account>
To check for the registered SPN type this in an elevated command prompt
setspn –L <domain\SQL Service Account>
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