Deployment of a cloud service may fail if the resources that are required to be allocated exceed the default or maximum quota allowed for your service at the region/datacenter level. For more information, see Cloud Services limits.
You could also track the current usage/quota for your subscription at the portal: Azure portal => Subscriptions => <appropriate subscription> => “Usage + quota”.
Resource usage/consumption-related information can also be retrieved via the Azure Billing APIs. See Azure Resource Usage API (Preview).
Source: Azure Documentation FAQ