However, based on your images, it seems you did it correctly. So, this could be an issue on the lab. Please restart the lab as follows:
Delete the instructions for the lab
Go to the question mark logo (help) and click the option “Get Latest Version”. This will re-download the instructions
Then, in the same help section, click on “Reboot.”
Try it again if it is still failing. Please wait until the Amazon AWS section expires (typically 2 hours), then rejoin the lab; it will create a new Amazon AWS, which should work as expected.