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```      ~ availabilityZones          : [
          ~ [0]: "us-east-2a" =&gt; "us-east-2Calling [toString] on an [Output&lt;T&gt;] is not supported.\n\nTo get the value of an Output&lt;T&gt; as an Output&lt;string&gt; consider either:\n1: o.apply(v =&gt; `prefix${v}suffix`)\n2: pulumi.interpolate `prefix${v}suffix`\n\nSee <https://pulumi.io/help/outputs> for more details.\nThis function may throw in a future version of @pulumi/pulumi."
          ~ [1]: "us-east-2b" =&gt; "us-east-2Calling [toString] on an [Output&lt;T&gt;] is not supported.\n\nTo get the value of an Output&lt;T&gt; as an Output&lt;string&gt; consider either:\n1: o.apply(v =&gt; `prefix${v}suffix`)\n2: pulumi.interpolate `prefix${v}suffix`\n\nSee <https://pulumi.io/help/outputs> for more details.\nThis function may throw in a future version of @pulumi/pulumi."
        ]```

looks like this works: ```        availabilityZones: vpc_subnet_zone_letters.apply( x =&gt; [
           `${region}${x[0]}`,
           `${region}${x[1]}`
        ]),```

so, seems like really the only way a lot of this works is to let the magic happen inside of the resource and not anywhere on the outside of things, i.e. they never resolve outside of a pulumi resource, which I guess makes sense, so don’t try it lol.

try ```
pulumi.interpolate`us-east-2${vpc_subnet_zone_letters[0]}`
```

tried it just to see.. I know I did try some `interpolate` commands, but it fails:

```        availabilityZones: [
            `us-east-2${pulumi.interpolate `vpc_subnet_zone_letters[0]`}`,
            `us-east-2${pulumi.interpolate `vpc_subnet_zone_letters[1]`}`
        ],```

```        availabilityZones          : [
            [0]: "us-east-2Calling [toString] on an [Output&lt;T&gt;] is not supported.\n\nTo get the value of an Output&lt;T&gt; as an Output&lt;string&gt; consider either:\n1: o.apply(v =&gt; `prefix${v}suffix`)\n2: pulumi.interpolate `prefix${v}suffix`\n\nSee <https://pulumi.io/help/outputs> for more details.\nThis function may throw in a future version of @pulumi/pulumi."```

try ```
pulumi.interpolate`us-east-2${vpc_subnet_zone_letters[0]}
```