as per the details given, it indicates only to convert the access type for the containers present. But after login, could find only the storage account present and without any container. Had to create the mentioned containers and proceed.
If this is the expectation, update the question which indicates, create the containers as well.
When I did the lab, both containers were visible, one with “Container” access, and one with “Private” access. Setting the one with “Container” access was pretty simple in the console.
When I did it, I just looked in the existing resources for the RG, which had the storage account. Looking at its Containers, there were only the two, and they existed.
It’s possible that your lab did not set up correctly, but at least when I did it, everything was where I expected it to be.