I am trying to connect my PostgreSQL database to my Power BI desktop.

I downloaded the certificate from https://s3.amazonaws.com/rds-downloads/rds-combined-ca-bundle.pem and installed in my machine. I am getting the same error as follows

Details: "An error happened while reading data from the provider: 'Npgsql.Tls.ClientAlertException: CertificateUnknown: Server certificate was not accepted. 
 Chain status: A certificate chain processed,
 but terminated in a root certificate which is not trusted by the trust provider.
. The specified hostname was not present in the certificate.
   at Npgsql.Tls.TlsClientStream.SendAlertFatal(AlertDescription description, String message)
   at Npgsql.Tls.TlsClientStream.ParseCertificateMessage(Byte[] buf, Int32& pos)
   at Npgsql.Tls.TlsClientStream.TraverseHandshakeMessages()
   at Npgsql.Tls.TlsClientStream.<GetInitialHandshakeMessages>d__43.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Npgsql.Tls.TlsClientStream.<PerformInitialHandshake>d__72.MoveNext()'"

My Npgsql version is 3.2.2.

Certificates are successfully imported like this.

I really do not know why is it still showing the error. Can somebody help me with this?