Hi sahil desai,
Welcome to the Microsoft Q&A Platform! Thank you for asking your question here.
We understand from your query that you are having trouble accessing your Azure Container Registry image. The error message you received indicates that the image is not accessible. This could be due to incorrect registry credentials or incorrect image name.
Check that the correct roles are assigned to the Azure Container Registry. If the registry has public network access enabled, ensure there are no firewall rules blocking the ACI's region. If you're using private endpoints, ensure the ACI is deployed in the same VNet and subnet.
For reference https://learn.microsoft.com/en-us/answers/questions/1146480/how-to-access-an-image-when-setting-up-a-container
https://learn.microsoft.com/en-us/answers/questions/1289158/container-image-unable-to-pull-private-azure-conta
If you have any further queries, please let me know.