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I suspect you might need to do something like this <https://github.com/pulumi/examples/blob/master/azure-ts-msi-keyvault-rbac/index.ts#L122>

<@UB39JFCKC> yes, that helped. What a shame ;)

I needed this more than once, so i came up with a helper.
```function principalId(appService: AppService): Output&lt;string&gt; {
    // Work around a preview issue <https://github.com/pulumi/pulumi-azure/issues/192>
    return appService.identity.principalId.apply(id =&gt; id || '11111111-1111-1111-1111-111111111111');
}```