New to MixPanel: Issues with Adding Users via Engage API

Hello everyone, I am new to MixPanel. What i am trying to do is: add new user to my user table in MixPanel when a user signups on my website, i am trying to do this through the engage API from my backend (xano), the request status is 200 but result is 0. I aslo tried it from Postman but still getting same result/response.