I am going after the Lightning Experience roll-out specialist badge and I am having issues with challenge #10. Could you give me some pointers on how to finish this challenge?  

Here is my error : The Lightning component named TrailheaDX must open a link to https://developer.salesforce.com/trailheadx/, must open in a new window (using the target attribute of ui:outputurl), and must be included in the Sales app. 

I tried everything (with controller, without controller, etc.), but still no green sign! Some people are talking about a bug. Could it be?

Please help...