Hi @David Lo!
When you look in your Zap history, can you see the Zap runs that should have happened when you got a Lead in Facebook? Specifically, are you seeing Zap runs with an error in them or are you not seeing Zap runs when you know you have had contacts?
If you can’t see Zap runs leads that you know have come in, please take a look at this help guide on Common Problems with Facebook Lead Ads. Facebook has a lot of permission settings so it’s important to check everything suggested in the guide. If that doesn’t help, the best thing to do is to contact the Support Team as they will be able to take a close look at your Zap and Facebook Lead Ad permissions with you. You can reach them using the Get Help form.