Azure Runbook Error, AzureRmStorageAccountKey Cannot Index into null array - powershell

Question

I am trying to run this command within an Azure Run book
(Get-AzureRmStorageAccountKey -Name $defaultStorageAccountName -ResourceGroupName $defaultResourceGroupName).Value[0]
It runs fine on my local machine and I can see the Storage Account Key. However, when I run the same command in Azure Runbook it throws the following error
Cannot index into a null array
If I just run Get-AzureRmStorageAccountKey -Name $defaultStorageAccountName -ResourceGroupName $defaultResourceGroupName in the Azure Runbook, it runs fine and I can see the Keys. It is just when I am selecting an element from an Array that it fails and throws an error.
The PowerShell version is 5 on my local machine and on Azure Runbook.
Update:
My issue was resolved after updating the Modules from the Gallery in my automation account.

Answer 1

According to your description, I test your cmdlets in my runbook, I could get storage key.
You could use the following commands to login your subscriptions.
Write-Verbose "Get connection asset: $ConnectionAssetName" -Verbose
$connectionName = Get-AutomationConnection -Name "AzureRunAsConnection"
$AzureCredentialAssetName = "AzureRunAsConnection"
try
{
# Get the connection "AzureRunAsConnection "
$servicePrincipalConnection=Get-AutomationConnection -Name $AzureCredentialAssetName
"Logging in to Azure..."
Add-AzureRmAccount `
-ServicePrincipal `
-TenantId $servicePrincipalConnection.TenantId `
-ApplicationId $servicePrincipalConnection.ApplicationId `
-CertificateThumbprint $servicePrincipalConnection.CertificateThumbprint
}
catch {
if (!$servicePrincipalConnection)
{
$ErrorMessage = "Connection $connectionName not found."
throw $ErrorMessage
} else{
Write-Error -Message $_.Exception
throw $_.Exception
}
}
$key=(Get-AzureRmStorageAccountKey -Name <storage account name> -ResourceGroupName <resource group name>).Value[0]
"The storage account key is $key"
More information please refer to this link.
Update
You need update Azure Storage account module version in automation account, then you could solve this issue.