copyIndex() inside a listKeys() - azure-resource-manager

Question

We're trying to deploy an ARM template which deploys a Stream Analytics job with n Event Hubs outputs depending on an input parameter.
Right now we're having success with all but the listKeys() function inside the outputs property copy loop function which gets each Event Hub's primary keys:
"sharedAccessPolicyKey": "[listKeys(resourceId('Microsoft.EventHub/namespaces/eventhubs/authorizationRules', variables('clientEventHubNamespace'), parameters('clients')[copyIndex('outputs')].id, variables('clientEventHubClientSharedAccessName')), '2015-08-01').primaryKey]"
We get the error:
17:44:31 - Error: Code=InvalidTemplate; Message=Deployment template
validation failed: 'The template resource
'tailor-router-axgf7t3gtspue' at line '129' and column '10' is not
valid: The template function 'copyIndex' is not expected at this
location. The function can only be used in a resource with copy
specified. Please see https://aka.ms/arm-copy for usage details..
Please see https://aka.ms/arm-template-expressions for usage
details.'.
However, if we change this to be a specific index:
"sharedAccessPolicyKey": "[listKeys(resourceId('Microsoft.EventHub/namespaces/eventhubs/authorizationRules', variables('clientEventHubNamespace'), parameters('clients')[0].id, variables('clientEventHubClientSharedAccessName')), '2015-08-01').primaryKey]"
it works.
Is copyIndex('propertyName') inside a listKeys() a supported function?
If not, is there a workaround that would achieve the same effect?
Kind regards,
Nick
Stream Analytics job resource definition:
{
"apiVersion": "2016-03-01",
"type": "Microsoft.StreamAnalytics/StreamingJobs",
"name": "[variables('routerStreamAnalyticsName')]",
"location": "[variables('location')]",
"dependsOn": [ "clientsEventHubCopy" ],
"tags": {
"boundedContext": "[variables('boundedContextName')]"
},
"properties": {
"sku": {
"name": "[parameters('routerStreamAnalyticsSkuTier')]"
},
"outputErrorPolicy": "drop",
"eventsOutOfOrderPolicy": "adjust",
"eventsOutOfOrderMaxDelayInSeconds": 0,
"eventsLateArrivalMaxDelayInSeconds": 5,
"dataLocale": "en-US",
"compatibilityLevel": "1.0",
"inputs": [
{
"name": "input0",
"properties": {
"type": "stream",
"serialization": {
"type": "Avro"
},
"datasource": {
"type": "Microsoft.ServiceBus/EventHub",
"properties": {
"serviceBusNamespace": "[parameters('input0EventHubNamespace')]",
"sharedAccessPolicyName": "[parameters('input0EventHubSharedAccessPolicyName')]",
"sharedAccessPolicyKey": "[parameters('input0EventHubSharedAccessPolicyKey')]",
"eventHubName": "[parameters('input0EventHubName')]"
}
}
}
}
],
"transformation": {
"name": "routing",
"properties": {
"streamingUnits": "[parameters('routerStreamAnalyticsSkuTier')]",
"query": "omitted"
}
},
"copy": [
{
"name": "outputs",
"count": "[length(parameters('clients'))]",
"input": {
"name": "[parameters('clients')[copyIndex('outputs')].id]",
"properties": {
"datasource": {
"type": "Microsoft.ServiceBus/EventHub",
"properties": {
"serviceBusNamespace": "[variables('clientEventHubNamespace')]",
"sharedAccessPolicyName": "[variables('clientEventHubClientSharedAccessName')]",
"sharedAccessPolicyKey": "[listKeys(resourceId('Microsoft.EventHub/namespaces/eventhubs/authorizationRules', variables('clientEventHubNamespace'), parameters('clients')[copyIndex('outputs')].id, variables('clientEventHubClientSharedAccessName')), '2015-08-01').primaryKey]",
"eventHubName": "[parameters('clients')[copyIndex('outputs')].id]"
}
},
"serialization": {
"type": "Avro"
}
}
}
}
]
}
},

Answer 1

Thanks for reporting this and sorry for the inconvenience.
I just talked to the ARM team, we had an issue when copyindex was inside the index tags eg 'array[copyindex()]'. It should be fixed now.
Let us know how it goes.
Thanks,
JS - Azure Stream Analytics