Trailhead Superbadge Error: Challenge not yet complete… There was an unexpected error while verifying this challenge – how to solve?

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ERROR DESCRIPTION If you landed on this page you have most probably come across the error message below: “Challenge not yet complete… here’s what’s wrong: There was an unexpected error while verifying this challenge. Usually, this is due to some pre-existing configuration or code in the challenge Org. We recommend using a new Developer Edition […]