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Don't use 'f' strings with pulumi string outputs, they won't work.
Use `pulumi.Output.format` instead, it works pretty much the same as the normal python format method but will handle any arguments that are outputs:
```policy['Statement'][0]['Principal']['AWS'] = Output.format("arn:aws:iam::{0}:root", account.id)```


Some more docs on this at <https://www.pulumi.com/docs/intro/concepts/inputs-outputs/#outputs-and-strings>

I was able to make it work! Thank you very much