How to find the service principal assigned to a newly created AKS cluster?
As Bruno Faria said, you can find the service principal in Azure Active Directory,
Azure Active Directory -> App registrations -> All apps
Also you can use
az aks list --resource-group <your-resouece-group> to find your service principal:
Hope this helps.
Go to Azure Active Directory >> App Registrations >> Select All Apps from the dropdown menu >> find your app and click on it.
The service principal will be the application Id and the secret will be the key under settings.
The output from "az aks list" should contain your service principal clientId.