1. Only one Lab can be run at a time. If you have a Lab running, make sure to end lab by clicking on   button before starting another Lab.

2. If you have logged into other aws accounts in the same browser, after clicking on the , you will be redirected to a page asking you to logout from the other aws account. 

• Click on the here (Marked in the red box in above screenshot) and close the existing browser tab. 
• Go back to the Hands-on Lab page and click again on the  . It will now open an AWS Management console environment in which you can perform the lab.

     3. For any lab, make sure that AWS region set to the N.Virginia.