I got this error when I was trying to configure Azure Container Registry (ACR) with my Kubernetes cluster. In my case, it was a mismatch between the username and the password that I used to create my secret.
This is the complete error message:
Failed to pull image "karbonacr.azurecr.io/hello-world:v12": rpc error: code = Unknown desc = Error response from daemon: Get https://karbonacr.azurecr.io/v2/hello-world/manifests/v12: unauthorized: Application not registered with AAD
Please see the video below 👇, this will show you the steps on how to correctly configure ACR with kubernetes.