You can now create a Classic Run As account from the Azure portal.
When you create a new Azure Automation account in the Azure portal, it automatically creates a Classic Run As account by uploading a certificate. This helps you to quickly start building and deploying runbooks to support your automation needs.
By using a Classic Run As account, you can provide a standardized way to authenticate with Azure when you're managing Azure Service Management or classic resources by using runbooks.
To learn more about creating the Run As account and the Classic Run As account via both the Azure portal and Azure PowerShell, see Authenticate Runbooks with Azure Run As account.