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It looks correct, the only thing that would make sense as I ran into similar with ListenerRules and conditions, is the [] indicates an array, remote the brackets and see what the outcome is.

The typescript definition expects an array - it won’t compile if you remove the brackets:

```rules?: pulumi.Input&lt;pulumi.Input&lt;inputs.wafv2.WebAclRule&gt;[]&gt;```

From my googling, I think you need to set one of `action` or `overrideAction` for your rule.  Unfortunately it seems this is a poor error message from AWS.

Thank you - AWS UX isn’t known to be the best…! That’s exactly what I needed! I think the Pulumi doc could be improved as well (it wasn’t clear that either parameters was required)