Patience is key.
Launching this EC2 entails it takes ~20 minutes before login is possible, however in my case it took an hour for everything to complete and be able to login with the credentials specified in the instructions. So here's the thing, the WebUI ONLY allows you to login to the console with the credentials provided, not SSH. I got the WebUI to load and it was still processing and performing tasks which took the entirety of 1 hour. Be patient, it'll complete and you will get to a login landing page, once you login with the user/pass it will work.
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