Update aks-error-code-page.md

Author: ryanberg-aquent

support/azure/azure-kubernetes/error-codes/aks-error-code-page.md

@@ -14,23 +14,25 @@ ms.custom: sap:AKS error codes, AKS errors
 
 This article describes common AKS errors and how to resolve them.
 
+## A-K error codes
+
 | **Error code** | **Description** | **Details and mitigation** |
 | --- | ---------- | ----------------- |
 | AADSTS7000222 - BadRequest or InvalidClientSecret | Authentication failure with Azure Active Directory. | This involves invalid or expired service principal credentials. For more information, see [AADSTS7000222 - BadRequest or InvalidClientSecret error](../create-upgrade-delete/error-code-badrequest-or-invalidclientsecret.md). |
 | Argument list too long | Application fails due to command line argument limitations. | The command line arguments exceed system limits in containerized applications. For more information, see [Application failures caused by the "argument list too long" error message](../create-upgrade-delete/application-fails-argument-list-too-long.md). |
 | AksCapacityHeavyUsage | Insufficient capacity in the Azure region. | There's high demand or limited resources in the selected region. For more information, see [Troubleshoot the AksCapacityHeavyUsage error code](akscapacityheavyusage-error.md). |
 | AKSOperationPreempted | Cluster operation is interrupted by a higher priority operation. | There are concurrent operations on the cluster, causing conflicts. For more information, see [AKSOperationPreempted or AKSOperationPreemptedByDelete error when performing a new operation](aksoperationpreempted-error.md). |
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+| AKS upgrade blocked | Upgrade fails due to version compatibility issues. | There's version skew, incompatibility, or an unsupported upgrade path. For more information, see [Troubleshoot AKS upgrade errors because of version skew, incompatibility, or lack of support](aks-upgrade-blocked.md). |
+| AvailabilityZoneNotSupported | Selected availability zone isn't supported. | the virtual machine (VM) size or region doesn't support the specified availability zone. For more information, see [Troubleshoot the AvailabilityZoneNotSupported error code](availabilityzonenotsupported-error.md). |
+| BadRequest or InvalidClientSecret | Authentication or request validation failed. | This involves an invalid service principal credentials or a malformed request. For more information, see [Error AADSTS7000222 - BadRequest or InvalidClientSecret](bad-request-or-invalid-client-secret-error.md). |
+| CannotDeleteLoadBalancerWithPrivateLinkService or PrivateLinkServiceWithPrivateEndpointConnectionsCannotBeDeleted | Unable to delete load balancer with active private link connections. | The load balancer has active private endpoint connections that must be removed first. For more information, see [Cluster autoscaler fails to scale with "cannot scale cluster autoscaler enabled node pool" error](lb-pvtlinksvcwithpvtendptconn-error.md). |
+| Can't scale cluster autoscaler-enabled node pool |Manual scaling conflicts with autoscaler. | This happens when attempting a manual scaling on a node pool with autoscaler enabled. For more information, see [A load balancer with a private link service or a private link service with private endpoint connections cannot be deleted](../create-upgrade-delete/cannot-scale-cluster-autoscaler-enabled-node-pool.md). |
+| Changing property "imageReference" is not allowed | Unable to modify the VM image reference. | This happens when attempting to change immutable VM properties on existing nodes. For more information, see ["Changing property 'imageReference' is not allowed" error message while upgrading or scaling an AKS cluster](../create-upgrade-delete/changing-property-imagereference-not-allowed.md). |
+| CniDownloadTimeoutVMExtensionError (41) | Container Network Interface (CNI) download times out. | There are network connectivity issues preventing the CNI plugin download. For more information, see [Troubleshoot Container Network Interface download failures](../create-upgrade-delete/error-code-cnidownloadtimeoutvmextensionerror.md). |
+| CreateOrUpdateVirtualNetworkLinkFailed | Failed to create or update DNS zone virtual network link. | Insufficient permissions or networking conflicts with private DNS zones. For more information, see [CreateOrUpdateVirtualNetworkLinkFailed error when updating or upgrading an AKS cluster](createorupdatevirtualnetworklinkfailed-error.md). |
+| CustomPrivateDNSZoneMissingPermissionError | Permissions missing for custom private DNS zone. | The service principal lacks required permissions on the private DNS zone. For more information, see [Troubleshoot the CustomPrivateDNSZoneMissingPermissionError error code](customprivatednszonemissingpermissions-error.md). |
+| DnsServiceIpOutOfServiceCidr | DNS service IP is outside the service CIDR range. | The configured DNS service IP doesn't fall within the Kubernetes service CIDR. For more information, see [Troubleshoot the DnsServiceIpOutOfServiceCidr error code](dnsserviceipoutofservicecidr-error.md). |
+| ERR_VHD_FILE_NOT_FOUND (65) | Virtual hard disk file not found during provisioning. | The node image virtual hard disk is unavailable or inaccessible. For more information, see [Troubleshoot the ERR_VHD_FILE_NOT_FOUND error code (65)](../create-upgrade-delete/error-code-vhdfilenotfound.md). |
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