I had been using IFTTT to integrate FB Leads to Google Sheets, then was using Activepieces with trigger new/updated sheet, to send lead to my email tool Kit.
FB does now offer direct Google Sheets integration, just go to Instant Forms on business.facebook.com, then go to tab CRM setup, and set up Google sheets integration. Then you can use Google Sheets trigger in Activepieces, to process your lead using Activepieces!!
This workaround can be used, as long as Activepieces does notget FB integration verified from Meta, see different discussions on that topic.