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```UserIds = userIds.ToOutput()```
I see that I can do this ; would this be the right direction?

check out the cast implementions on `InputList&lt;T&gt;` here: <https://www.pulumi.com/docs/reference/pkg/dotnet/Pulumi/Pulumi.InputList-1.html>

You'll see that `InputList&lt;T&gt;` can be cast to `Output&lt;List&lt;T&gt;&gt;` or `Output&lt;T&gt;[]` or `Output&lt;IEnumerable&lt;T&gt;&gt;`. But simply casting it to `Output&lt;T&gt;` doesn't work, you're losing the collection part of the type

Actually it's a different issue, you can't go `Input -&gt; Output` you can only cast `Output -&gt; Input`. So yes in this case `.ToOutput()` is what you want and it should give you `Output&lt;ImmutableArray&lt;string&gt;&gt;`