The SQL Server Network Interface library could not register the Service Principal Name (SPN) for the SQL Server service. ...

The SQL Server Network Interface library could not register the Service Principal Name (SPN) for the SQL Server service. Error: %1!s!, state: %2!s!. Failure to register an SPN may cause integrated authentication to fall back to NTLM instead of Kerberos. This is an informational message. Further action is only required if Kerberos authentication is required by authentication policies.