Sessions Pass to Electron React App



So I am quite new to this, and have a tight timeline, so here goes nothing. I am trying to create a login system using express and passport for the backend, and react redux in the front end wrapped into Electron.

I have the login working for the backend when using Postman, but when I am using react the session cookie is not being passed to the frontend, so it is not allowing me to login or stay logged in.

I should add I am also using isomorphic fetch.