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David HamburgDavid Hamburg 

error id: TOZVMWLA

Lightning Experience Rollout Specialist  step 7

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 (DE) to check this challenge. If you're using a new DE and seeing this error, please post to the developer forums and reference error id: TOZVMWLA
This seems to be a common error with people reusing existing trailhead playgrounds/sandboxes. I would recommend setting up a new playground for each of the big badges like the superbadges. I noticed this doesn't make the error appear when you establish new ones.
David HamburgDavid Hamburg
I started with a new playground and got this, also stood up a 2nd one and it gave an error when geting to teh end of this one, goingto back fill some of the other steps, good practis but still a pain