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If you do mutations within an apply you must return a new object and use that.

It looks like you're trying to use apply to mutate the unwrapped settings object that you have access to in the apply. You can't really do this unless capture and use the resulting output.

I was thinking that might be the case. What I’m not sure of is how to ‘use’ the new object that is returned

At a high level, AppSettings will need to be specified at the time that `appService` is initialized.

You should be able to do something along the lines of (pseudo code):
```var ai = new AppInsights();
var settings = ai.key.apply(
... create your app settings here
)
var as = new AppService(... { settings })```
You can use `All` to coordinate multiple values if necessary <https://www.pulumi.com/docs/intro/concepts/programming-model/#all>

You know. I was stuck in thinking the other way around, but you got me sorted. Thanks!

<@UQ8K13T7X> , worked like a charm. You da man