Hello GYANASREEJA PATNALA,
Greetings! Welcome to Microsoft Q&A Platform.
Sandbox is not supported in Microsoft Q&A and the supported products are listed over here https://learn.microsoft.com/en-us/answers/products. However, please check the below factors to troubleshoot your issue.
Ensure that you’ve activated the Azure sandbox. This process creates a Learn directory that you can use, review permissions, accept, etc. Complete the steps and then you create a new container.
Check if you have changed your directory by clicking on your profile and then change the directory and select Microsoft Learn Sandbox.
Please ensure that you need to use your own personal account for the sandbox to activate As in the case of work account authentication and authorization is defined by your IT admin and hence won't allow you to activate/create paid resources (unless you are on the approved list) or free sandboxes. Try using your own Microsoft account. Create a new free account if you don't have one yet.
I will suggest you review sandbox FAQ: https://learn.microsoft.com/en-us/learn/support/faq?pivots=sandbox.For troubleshooting know issue you can refer here: https://learn.microsoft.com/en-us/learn/support/troubleshooting
you can report sandbox related issues in the below document > Report feedback > Product or functionality - troubleshooting
Hope this answer helps! Please let us know if you have any further queries. I’m happy to assist you further.
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