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The type of `vpc.ID()` is `IDOutput`, a kind of <https://www.pulumi.com/docs/intro/concepts/inputs-outputs/#outputs-and-strings|Pulumi output>, which means it can’t just be cast as a string, because its value is computed during the deployment (so it can’t be supplied to the lookup function as a “prompt” value). You can however obtain and use the computed string by converting the ID output to a string output, then doing the lookup in the string output’s `.Apply()` --

Here’s a complete example based on the code you provided: <https://gist.github.com/cnunciato/cd2b7dc8b8312de0e43cf6d8fd2c8e9d>

Hope that helps! Outputs are a tricky thing to pick up and get used to (and can be cumbersome in Go), but once you do, it’s generally smooth sailing.

Perfect! Thank you, I wouldn't have thought of using ApplyT at all ...