How to initiate assistant with get started button on facebook messenger

Hi guys!
i created a chabot in Voiceflow and already connected to facebook page messenger. I set up Get Started button using facebook graph API. After user presses Get Started button my assistant should greet and offer choices but instead it goes to one of my no match sections...i tried to set up intent with name get started in the beginning that will go to greeting once triggered, but its not working as intended. i've tried to solve this for 2 days now