Closed Beta Key entry not working - solution
Manually enter the key, or paste it in and remove the dashes. Either method works.
I followed the instructions in the email for accessing the beta. I created my account and went to enter my beta key.
The instructions were something like:
1. Enter beta key
2. Click submit
3. Click Play now
This didn't work and I was left looking at a little miner icon working for a very long time.
The fix, I found, is to enter the beta key without the dashes. Then you can click submit and play now. See you in the game!