IaC - private-network-standard-agent-setup - Failing

Deployment using the 'Deploy to Azure' wizard in infrastructure-setup/15-private-network-standard-agent-setup fails giving the below error.
Deployment is done in a new empty resource group with no existing resources or Vnets , so the bicep is creating everything from scratch.
Any ideas on where to look to debug? @geabdluca @sansinh @fosteramanda

{ "code": "DeploymentFailed", "target": "/subscriptions/***/resourceGroups/***/providers/Microsoft.Resources/deployments/ai-aiservicesn4lt-n4lt-deployment", "message": "At least one resource deployment operation failed. Please list deployment operations for details. Please see https://aka.ms/arm-deployment-operations for usage details.", "details": [ { "code": "ResourceDeploymentFailure", "target": "/subscriptions/***/resourceGroups/***/providers/Microsoft.CognitiveServices/accounts/aiservicesn4lt", "message": "The resource write operation failed to complete successfully, because it reached terminal provisioning state 'Failed'.", "details": [ { "code": "OperationError", "message": "Failed to Create the resource. Provisioning state: Failed", "details": [ { "code": "ResourceProviderError", "message": "Failed to create Aml RP virtual workspace due to System.Exception: Failed async operation\n at Microsoft.CognitiveServices.ResourceProvider.AmlRp.AsyncOperationHelper.PollUntilCompleteAsync[T](TraceContext traceContext, HttpResponseMessage response, HttpClient httpClient, Int32 timeoutInMin, CancellationToken cancellationToken) in /__w/1/s/src/Common/ResourceProvider/AmlRp/AsyncOperationHelper.cs:line 85\n at Microsoft.CognitiveServices.ResourceProvider.AmlRp.AmlRpClient.PutAmlRpVirtualHubAsync(TraceContext traceContext, Dictionary2 headers, ResourceIdentityInArm resourceIdentity, String primaryUserAssignedIdentity, String internalId, KeyVaultProperties keyVaultProperties, String subscriptionId, String resourceGroupName, String workspaceName, List1 networkInjections, PublicNetworkAccessType publicNetworkAccessType, CancellationToken cancellationToken) in /__w/1/s/src/Common/ResourceProvider/AmlRp/AmlRpClient.cs:line 119\n at Microsoft.CognitiveServices.ResourceProvider.AmlRp.AmlRpService.PutAmlRpWorkspaceAsync(TraceContext traceContext, ResourceRequestContext requestContext, WorkerMessageRequestContext workerMessageRequestContext, IResourceEntity insertedResourceEntity, CancellationToken cancellationToken) in /__w/1/s/src/Common/ResourceProvider/AmlRp/AmlRpService.cs:line 124\n at Microsoft.CognitiveServices.ResourceProvider.Worker.MessageProcessor.ProcessInternalAsync(TraceContext traceContext, RpWorkerQueueMessage message, CancellationToken cancellationToken) in /__w/1/s/src/ResourceProvider/Rp.WorkerRole/AccountProvisioning/MessageProcessor.cs:line 297" } ] } ] } ] }

Start in samples/microsoft/infrastructure-setup/15-private-network-standard-agent-setup and reproduce the Deploy to Azure wizard deployment in an empty resource group. Use the ARM deployment operations guidance linked in the error to identify the failed operation and determine what change is required; done means the sample deploys successfully from scratch.