Hi Jovi,
Unsure which module you are working on, but please give my instruction below a try. Let me know your results in a comment. For some cases I will need you to do some more steps to make it work.
You should be able to work around the issue by first Activating the sandbox (solving puzzles, reviewing permissions, etc.) and then once you see the sign-in box appear on the right open a new browser tab. In this new tab, browse to https://shell.azure.com. If your existing sandbox hasn't expired you can use that instead of activating a new one.
When prompted, click Bash (You can switch between Bash/PowerShell using button at top of cloud shell window if needed)
Next choose No storage account required, for Subscription select Concierge Subscription, and click Apply.
After several seconds delay while a cloud shell is requested and connected to, you should see $ prompt. At this point you can complete the exercises instructions, copy/paste code from exercise tab to cloud shell tab as needed, etc.
Please click Accept Answer and upvote if the above was helpful.
Thanks.
-TP