Hi,
There is a bug in the exercise whereby the code blocks have "[sandbox resource group name]" instead of the correct name similar to "learn-0ac1d87f-a26e-1028-ec61-3b28ce1d6393". It is essential that the commands you use have the correct resource group name since you only have permission to the learn-xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx group and cannot create a new resource group.
Please use instructions below to workaround the issue.
Please navigate to the Create an Azure virtual machine exercise, Solve puzzle as requested, Activate a new sandbox, sign in, review permissions, etc. Once sandbox is activated and black cloud shell window with "Welcome to Azure Cloud Shell" displayed, navigate to Exercise - Configure network access using the "Unit x of 14" dropdown above the exercise.
After page loads and resource group name is updated to learn-, immediately navigate back to Create an Azure virtual machine exercise, solve puzzle, etc., and complete exercise. Please make sure you click the Copy button in upper right of each code block, right-click Paste into Cloud Shell window on right, then press Enter to execute command.
Inspiration for above workaround came from @pnaroju's #2 suggestion in this post.
Please click Accept Answer and upvote if the above was helpful.
Thanks.
-TP