Mongodb connection working in sandbox but not in application

Hello Everyone,

I followed this tutorial: Custom Databases: Connecting Auth0 to MongoDB - YouTube

on how to set up auth0 with my mongodb account, and when I use the “TRY” button on the Auth0 sandbox my connections are working and my users are being created.

When trying to do the same thing with my react application, nothing is getting sent to my db?

Anything im missing here ?