Yáʼátʼééh! This is the info by the Duo Team:
We want to know what folks think of the course so far and what they'd like to see in upcoming skills! As learners share their feedback over the coming weeks, contributor teams will use this information to improve and expand the course. The courses will soon include challenge types with native speaker audio.
All are welcome to support this project by signing up for either course and submitting your feedback via the “report” button within each lesson.
I hope it helps. :)