Our Azure reference focuses on ARM deployment failures, Entra ID authentication and authorization errors, and storage/runtime service exceptions. Each guide maps provider messages to actionable checks across tenant, subscription, resource group, and policy layers used in real operations.
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Azure returns `ImageNotFound` when the VM image reference cannot be resolved for the selected region, subscription, or source registry.
Azure Storage returns `InvalidAuthenticationInfo` (401) when request authentication details are missing or invalid and the service cannot authenticate the caller.
Azure Resource Manager returns `InvalidAuthenticationTokenTenant` when the access token was issued by a tenant that does not match the target subscription tenant.
ARM returns `InvalidRequestContent` when deployment payload values are unrecognized for the target resource type or required values are missing.
ARM returns `InvalidResourceLocation` when a storage account name already exists in your subscription but in a different location than requested.
ARM returns `InvalidResourceReference` when a referenced resource is missing or referenced with an incorrect identifier/path.
Azure Blob service returns `LeaseIdMissing` when an operation requiring an active lease ID is sent without that lease header.
ARM returns `NotFound` when a deployment operation references a resource that is unavailable at evaluation time.
ARM returns `OperationNotAllowed` when the requested deployment action violates SKU, quota, policy, or resource-state constraints.
ARM returns `ResourceGroupNotFound` when the target resource group does not exist in the active subscription context.
Azure returns `ResourceModified` when a conditional update targets a stale resource version that changed after it was read.
Azure Resource Manager returns `ResourceNotFound` when it cannot locate the requested resource in the active subscription and resource group context.
ARM returns `ResourceQuotaExceeded` when a deployment exceeds quota limits at subscription, resource group, or region scope.
Azure Storage returns `ServerBusy` (503) when request load exceeds what the target partition/account can handle at that moment.
Azure returns `StorageAccountAlreadyTaken` when the requested storage account name is already in use globally.