Hello @Sabyasachi Mukherjee ,
Yeah , that error message is expected when the storage account access is restricted.
Couple of options:
1) Try to whitelist the Azure Pipeline VM Host Agent IP in the Storage Account Networking Section (OR)
2) Try to join the Nodes in a VNET where that particular storage account has access to (OR)
3) Consider using Private Endpoints (Have a look at the Answer mentioned at https://stackoverflow.com/questions/65019375/access-azure-storage-account-from-pipeline-agent-in-same-region-with-access-rest)
Similar issue was answered at : https://learn.microsoft.com/en-us/answers/questions/474302/access-azure-storage-account-from-pipeline-agent-i.html
Regards,
Shiva.