How to view datamart refresh error message

My datamart in the Power BI service is failing to refresh. I would like to know what is causing the failure. When I click on the red triangle with the exclamation mark, nothing happens.

Additionally, if I click on the three dots next to the datamart, select "Refresh", and then select "Refresh history", I can see the refresh history, but all the download buttons do nothing if Status = Failed. 

Therefore, my question is: How can I view the error message associated with the refresh failure?