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Because they are different types from TypeScript pov. You’d need to add a type check/convertion.

Your type should be:
```export const getSigningKey = (
        secretKey: string | pulumi.Output&lt;string&gt;,
        region: pulumi.Output&lt;digitalocean.Region&gt; | pulumi.Output&lt;aws.Region&gt;
) =&gt; {...};```

You accept either of the two outputs, not an output that can resolve to one of those regions

Also, it would be better if you use `pulumi.Input` as it includes passing the internal type directly or with a promise. Then in your function you can use `pulumi.output(region)`

<@USC68LB3J> thanks, you're right that was an error on my part to not distinguish between either of two outputs and an output that could resolve to either. much appreciated.