issue with Analyze and activate your data with Looker Enterprise task 6

[benamer]

I am trying to complete one of the Google Cloud analytics labs titled "Analyze and activate your data with Looker Enterprise".
I finished all the tasks successfully, but task 6 never shows as completed even I am sure 100% the task was completed many times, no matter how many times I tried.
is there any well-known issue with Looker