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The biggest trouble was the requirement to have 20 people in the closed testers track for 14 consecutive days before being allowed to apply for production.
I've heard similar feedback on #7. My plan is to reduce the digit count from 6 to 4, which should still prove you understand how the puzzle works, without making it unnecessarily complicated.
Thanks again for the feedback! I hope this helps unblock you and that you have fun with the rest of the game.