(BadRequest) The VM size of AgentPoolProfile:nodepool1 is not allowed in your subscription in location 'westus'. For more details, please visit https://aka.ms/aks/quotas-skus-regions

Problem encountered on https://dotnet.microsoft.com/en-us/learn/aspnet/deploy-microservice-tutorial/azure-resources
Operating System: windows

Provide details about the problem you're experiencing. Include your operating system version, exact error message, code sample, and anything else that is relevant.

on command: az aks create --resource-group IoutilityApp --name IoutilityCluster --node-count 1 --enable-addons http_application_routing --generate-ssh-keys
response : Resource provider 'Microsoft.ContainerService' used by this operation is not registered. We are registering for you.
Registration succeeded.
(BadRequest) The VM size of AgentPoolProfile:nodepool1 is not allowed in your subscription in location 'westus'. For more details, please visit https://aka.ms/aks/quotas-skus-regions
Code: BadRequest