Facebook Insights notes/limitations

Important: At this time, FB reels are not supported via META's API.
Historical limitations: Facebook Insights’ API will not retain any data older than 2 years, as stated at the top of their technical documentation here: https://developers.facebook.com/docs/graph-api/reference/v4.0/insights. Therefore, if you go back further than 2 years in the past in your dashboard, your widgets will not show any data.
Demographic dimensions limitations: Due to the particularity of Facebook Insights’ API, demographic dimensions such as Age, Gender, Age Gender, City, and Country, will only be returned if there is data for 100 or more people.
At this time, posts with attachments will be filtered out of the results which may cause some discrepancies.