I have suddenly started getting 'Not enough data' as the App install source ad / adset when I see an app event report and try to find the source adset for the app event.
It is showing even when I have more than 2000 count for that event. Not enough data is only shown when you have only fewer events.
I last checked for Mar month on Apr 2nd when it was showing me the app install source adset for my events perfectly. But, when I check the data for March now, it does not show me the app install source data for the custom events.