I have a feature class, "patchlocation". This FC is related to table "Rack" 1:M. The table "Rack" is then related to a table "Patchpanel" 1:M. In ArcMap, I can identify a "patchlocation" on the map and then look at related racks and from each rack, related patchpanels. I published map to service but when I identify in AGOL, I only get related racks. Is this type of "nested" relationship supported in AGOL?
I think I see the issue you are seeing. It seems to only happen when you get into the nested relationship scenario. Record to Record is working but going into nested relationships -> Record to Record to Record is showing 0s. Can you log a bug with support that you can track the issue?