Hi ervin burris,
Thank you for reaching out to us on the Microsoft Q&A forum.
Based on your query, we understand that you are experiencing difficulty accessing the sandbox used in a previous learning module.
As mentioned in the document for the unit "Exercise - Start a project" under the section "Create and add (stage) a file":
"Make sure your Azure Cloud Shell session is still active and that you're in your repo folder named Cats."
It is essential to have an active sandbox and be in the specified folder before starting the exercise.
We recommend activating a new sandbox and completing the previous module, 'Introduction to Git,' first. Ensure that you complete the next module within the same activation period of the sandbox.
Microsoft Learn sandboxes are temporary environments designed to practice concepts. They have a limited lifespan of 1, 2, or 4 hours depending on the module. These sandboxes automatically deactivate after a period of inactivity and require reactivation upon expiration.
Please note that you are allowed 20 sandboxes per day, with additional sandboxes available the following day.
If you continue to face issues, please let us know in the comments. We are happy to assist you further.
If the information is helpful, please consider clicking the "Upvote" and "Accept Answer" on the post.