Facebook is changing the data retention period for the Ad Manager UI and Marketing Graph API from lifetime to last 37 months. This change should already be live in the Facebook Ad Manager UI and the API retention will be adjusted at the end of May.
Based on the version of the API we are using for the Supermetrics data source, this change will affect our Facebook Ads data source on May 24th, 2021. After that point, you may receive an error if trying to request ad insights data more than 37 months in the past and will need to adjust your queries to be inside the new limit.
For more information on this change please see Facebook's announcements and documentation:
https://developers.facebook.com/blog/post/2021/02/23/introducing-graph-v10-marketing-api-v10/ (note this says the change will be on the 24th but the change log says 25th. For safety, we are assuming the sooner date is correct)