Hi,
What you are seeing is normal and expected so far.
You need to continue on and complete Unit 9 Exercise - Configure network access before your sandbox expires. In the Unit 9 exercise you will create Network Security Group (NSG) inbound rule so that you can check if web site is functioning properly.
If your sandbox expires before you finish the Unit 9 exercise, go back to Unit 3 Create an Azure virtual machine exercise, Activate sandbox, complete all the tasks, then jump back to Unit 9 and complete it. These two exercises need to be completed in sequence within the 1 hour time limit for the sandbox.
Please click Accept Answer and upvote if the above was helpful. If something is unclear or you need further assistance, add a comment below.
Thanks.
-TP