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<https://www.pulumi.com/docs/intro/concepts/inputs-outputs/>

Sorry, I tried `.all` and `.concat` but still not working.

That error message says it's trying to wrap a fat arrow function in a `pulumi.Output`, instead of an array of string outputs, and that needs to be resolved. What's the type of `vpc.getSubnetsIds`? Is it a member or method that you've created? Or a typo?