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-.ts

given the `[object Object]` in the error, I think you need to tell Pulumi to transform the sa's outputs to the new string

e.g.
```
pulumi.interpolate`${project}:${role}:${sa.email}`
```
and
```
pulumi.interpolate`serviceAccount:${sa.email}`
```

where do I run the transform - doesn't like it inline

no? I've used it inline a lot I think. :confused:

it's a relatively new addition to pulumi - in 0.16.11 a couple weeks ago in case you're on a version older than that

So the issue is that the resource name requires a `string` all other arguments require `pulumi.Input&lt;String&gt;`. Pulumi needs the resource name "early" to ensure uniqueness so it can't depend on any `Output` values.

so using `pulumi.interpolate...` on the `member` value will work

but we'll need to compose an actual string for the resource name

so something like this :
```typescript
export function createIamMemberFromServiceAccount(
    roles: string[],
    members: gcp.serviceAccount.Account[],
    project: string
) {
    roles.forEach(role =&gt; {
        members.forEach((sa, idx) =&gt; {
            new gcp.projects.IAMMember(`${project}:${role}-${idx}`, {
                member: pulumi.interpolate`serviceAccount:${sa.email}`,
                project,
                role
            });
        });
    });
}
```

from what I can tell, the name for an IAMMember only matters for Pulumi's needs, not GCP's. GCP never sees it.