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vinny rvinny r 

Lightning readiness report is not running


When I try to run the lightnig readiness report in the trailhead playground for Lightning Experience Rollout Specialist Challenge-1, I am getting the below error. I have tried running the report multiple times and I am getting the same error for last 3 days.

Offline for maintenance. The app in undergoing maintenance right now. Please check back later.

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SandhyaSandhya (Salesforce Developers) 

I would suggest you connect developer edition from launch and try to run check in developer edition or try in another trailhead playground.

Please mark it as solved if my reply was helpful. It will make it available for other as the proper solution.
Best Regards