Hi SHASWATA DAS,
We sincerely apologize for any inconvenience you experienced in accessing the sandbox.
We recommend a workaround for the time being till the sandbox gets available. We suggest signing up for an Azure free account through the provided link: https://azure.microsoft.com/en-us/free where you can create a sandbox environment.
Kindly, note that you may be able to complete this module's exercises using your personal subscription, but charges may apply and you may have to modify the instructions for your subscription. Ensure to delete the resources after your lab/exercise deployments to save the charges.
For guidance on running Microsoft Learn training exercises in your own subscription, please refer to this link: https://learn.microsoft.com/en-us/training/support/use-your-own-subscription.
If you find this information beneficial, we kindly request you to acknowledge it by clicking the "Upvote" and "Accept Answer" buttons on the post.
Thank you.