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Make sure that you have connected to same org from "Launch"where you have installed the app.
Follow below steps to install the app in trailhead playground.
1.Log into trailhead.
2.Create new trailhead playground, select it and click "Launch your hands on org"
3.Refer below link and get trailhead playground username and password.
https://force.desk.com/customer/portal/articles/2659738-how-to-get-a-password-for-my-trailhead-playground?b_id=13478
4.Log into App Exchange from another browser or copy paste the download link in an incognito window.
5.Install in production by providing trailhead playground credentials.
6.Click on "Launch" and check in trailhead playground if App is installed and then check for challenge.
Please mark it as Solved if my reply was helpful. It will make it available for other as the proper solution.
Best Regards,
Sandhya