Thank you for reaching out to Microsoft Q & A forum.
According to the context provided, it's advisable to replace "[sandbox resource group name]" with the default resource group name starting with "learn." This substitution should be made next to the -resource-group name, as demonstrated in the accompanying screenshot below.
Note: Please avoid using a custom resource group name like (e.g., my-group-01). Instead, consider using a resource group name that starts with learn-learn-e5e3aab9-e847-45ad-8fbd-a74bc96aa80e, as shown in the provided screenshot below.
If you encounter any future issues, please feel free to contact us, and we will be pleased to assist you further.
If you have found the answer provided to be helpful, please click on the "Accept answer" and "Upvote" button so that it is useful for other members in the Microsoft Q&A community.
Thank you.