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Hey Tobias, I think we need more of your code to provide a more complete answer, but it sounds like you're trying to take an output from your RDS instance and then construct a connection string based on it to provide to the SecretBackendConnection resource. When you need to manipulate a resource property in this manner (e.g. appending text to it), you need to use one of the

.apply

or

.concat

function to do the manipulation. There's more information on manipulating resource outputs at https://www.pulumi.com/docs/intro/concepts/programming-model/#apply and there's a connection string example at https://www.pulumi.com/docs/intro/concepts/programming-model/#all.