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Henry Burns 2Henry Burns 2 assessment app

I see a number of people are having the same issue. What is the preferred solution?
SandhyaSandhya (Salesforce Developers) 
Hi Henry Burns,

 While installing the App, we have to provide proper DE credentials.
1.First, we have to check in "Launch your hands on org " dropdown whether DE is connected or trailhead playground is connected.

2.If DE is connected then provide DE credential while installing the assessment app choosing "Log in to production."

3.If trailhead playground is connected, then you need to provide trailhead playground credentials.Please refer below link on how to get credentials of trailhead playground.
Hope this helps you!Please let me know If you need further help.

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