Per the Facebook Graph API, pages with fewer than 100 likes/followers do not have Insights generated for them.
https://developers.facebook.com/docs/graph-api/reference/v2.12/insights
Likewise, demographic metrics, such as age, gender and location, are available in Page Insights once there is data for 100 or more people.
If you are using a page with fewer than 100 like, you may get little to no data from this connector due to this limitation.