Unfortunately, you have denied OneBox employees access to your box, so we cannot see exactly what the action is.
If you mean "Get leads from facebook" - then around September 1st, facebook completely changed the rules of the game, closed the old API, changed the rules for issuing a marketing api token and its lifespan.
You need to get facebook token again and now it's not an easy task.
https://developers.facebook.com/docs/marketing-api/guides/lead-ads/retrieving/Specify the name of the action you have, and I will try to describe in detail how to get a new token.