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what's the deal with azure role assignments... I've had to specify the name like this :
```const mppbuildRoleAssignment = new azure.role.assignment("mppbuild", {
    name: "00000000-0000-0000-0000-000000000000",
    principalId: adServicePrincipal.id,
    scope: config.mppbuild.then(x =&gt; x.id),
    roleDefinitionName: "Reader"
});```

but i get things like:
```azure:role:assignment: mppbuild
error: Plan apply failed: authorization.RoleAssignmentsClient#Create: Failure responding to request: StatusCode=400 -- Original Error: autorest/azure: Service returned
an error. Status=400 Code="RoleAssignmentUpdateNotPermitted" Message="Tenant ID, application ID, principal ID, and scope are not allowed to be updated."```

am i doing something fundamentally wrong?

config.mppbuild in this context is from :
```export let mppbuild: Promise&lt;azure.containerservice.GetRegistryResult&gt; = azure.containerservice.getRegistry({ ... ```

ah <https://github.com/pulumi/pulumi-azure/issues/121>