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arn

is an output, you can't use that with backtick formatting. Look at the docs at https://www.pulumi.com/docs/concepts/inputs-outputs/#outputs-and-strings and for JSON policies like this https://www.pulumi.com/docs/concepts/inputs-outputs/#outputs-and-json

@echoing-dinner-19531 Yeah, I wrapped my whole stack in a

const main = async () => {} …

construct and made the wrong assumption that a

const bucket = await new aws.s3.bucket()

would resolve the Promise/Output.

Yeh no worries, output values are the most unusual part of the Pulumi SDKs. Nearly everyone trips up on them first day.

Hehe, yes. I thought I had mastered them, but my naive thinking of await new .. threw me off track. 🙂