You created the user with the native_password right? There might be a setting in RDS that disables this method 
Alternatively you can use AWS RDS MariaDB instead of MySQL (drop in replacement for MySQL, and it’s open source!)
You created the user with the native_password right? There might be a setting in RDS that disables this method 
Alternatively you can use AWS RDS MariaDB instead of MySQL (drop in replacement for MySQL, and it’s open source!)