Hello @Parth Patel ,
Thanks for your query.
Are you getting the above error message when you are trying to authenticate ACR using ImagePullSecrets ?
Can you also try to validate by logging into the node and pulling the Image manually , just to check if it goes through ?
When you attempted Step1 (using SP) as a part of resolution , were you able to pull the same Image from ACR successfully , instead of hello-world Image ?
if not , please make sure your SP has ACRPULL role on your ACR.
https://learn.microsoft.com/en-us/azure/container-registry/container-registry-faq#how-do-i-grant-access-to-pull-or-push-images-without-permission-to-manage-the-registry-resource-
Also try to attach the ACR to AKS using the command mentioned below
https://learn.microsoft.com/en-us/azure/aks/cluster-container-registry-integration?tabs=azure-cli
az aks update -n myAKSCluster -g myResourceGroup --attach-acr <acr-name>
Regards,
Shiva.