Yes password encryption type is an issue. AWS support gave me a similar answer. they said scram-sha-256 is not supported. you can find out about your password encryption type with the SCRAM command either in the query editor or with CLI, see reference [reference] https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/PostgreSQL_Password_Encryption_configuration.html#PostgreSQL_Password_Encryption_configuration.getting-ready