I am playing with insights in AGOL today for the first time.
I published 8 layers (demographic data, mostly numbers) in a feature service stored in a secure folder in ArcGIS server 10.2.
I added the service as item in AGOL, storing the credentials.
I add the data on insight for AGOL. I add a map in the workbook and I see it, I can click on a single region and see the statistic for the area but, when I try to add a chart (or a table) instead of a map I get the "something went wrong" error.
I read a question here, about a similar error in portal, but I could not get any help.