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is the problem that you can’t write such a function at all, or that it’s not clear how to do it reliably

pass an array of their emails to a function that uses them to assign those 2 accounts to the same role.

It sounds like you are likely trying to use an `Output&lt;T&gt;` as a `name` parameter on a resource. That won’t work, and you will need to pick a name that is known up front (before the resource ultimately gets created). 

You can generally do this by passing a name into the code that is creating these resources, and ensuring that callers pass both the name and any `output`s that are need to initialize it. 

If you have code you could share, we could give more precise guidance. 

export function createIamMemberFromServiceAccount(
  roles: string[],
  members: Input&lt;string&gt;[],
  project: string
) {
  roles.forEach(role =&gt; {
    members.forEach(sa =&gt; {
      new gcp.projects.IAMMember(`${project}:${role}:${sa}`, {
        member: pulumi.concat("serviceAccount:", sa),
        project,
        role
      });
    });
  });
}

That’s right - the `sa` part will tostring to `[object Object]` which will not work. Suggest that callers of this pass in an explicit member name, or use the loop index instead of the Output as part of the name. 