我正在尝试运行API管理服务的备份。我可以在PS中从我的本地机器上使用下面的代码在我的子所有者登录上下文中完成此操作。
当我尝试将其作为Runbook运行时，我只得到：

Suspended
The runbook job was attempted 3 times, but it failed each time.  Common reasons that runbook jobs fail can be found here:  https://docs.microsoft.com/en-us/azure/automation/automation-troubleshooting-automation-errors

没有错误，只有上面的。
我尝试在用户和系统分配的身份下运行，结果没有任何差异。

$method="UA"
    $apiManagementName="xxxx-Prod";
    $apiManagementResourceGroup="xxxx-Prod";
    $storageAccountName=xxxxstorage";
    $storageResourceGroup="xxxations";
    $containerName="xxxxbackups";
    $blobName="prodnpapim.apimbackup"
    $date = (Get-Date).ToString("yyyyMMdd")
    $outputBlobName = "$($date)$($blobName)"
    
    $identityName = "xxxx-OPS-MID";
    $identityResourceGroup = "xxxxtions";
    
try
{
    "Logging in to Azure..."
    Connect-AzAccount -Identity
}
catch {
    Write-Error -Message $_.Exception
    throw $_.Exception
}

$storageKey = (Get-AzStorageAccountKey -ResourceGroupName $storageResourceGroup -StorageAccountName $storageAccountName)[0].Value

$storageContext = New-AzStorageContext -StorageAccountName $storageAccountName -StorageAccountKey $storageKey

"Starting backup"

try{
    Backup-AzApiManagement -ResourceGroupName $apiManagementResourceGroup -Name $apiManagementName `
        -StorageContext $storageContext -TargetContainerName $containerName -TargetBlobName $outputBlobName
}
catch{
    "Backup-AzApiManagement error"   
    exit
}

没有任何错误，我卡住了-鉴于它在本地PS工作正常。
我哪里做错了？