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``` source=aws.codebuild.ProjectSourceArgs(
            type="S3",
            location=f"{codebuild_functional_bucket.id}/"

        ),```

Fixed by changing to:

```        source=aws.codebuild.ProjectSourceArgs(
            type="S3",
            location=codebuild_functional_bucket.id.apply(lambda id: f"{id}/"),

        ),```

You should also be able to use <https://www.pulumi.com/docs/intro/concepts/inputs-outputs/#:~:text=single%20output%3A%0Aurl%20%3D-,Output.concat,-(%22http%3A//%22%2C%20hostname%2C%20%22%3A%22%2C%20port|Output.concat> here for slightly cleaner code