ChatGPt Action request not sending cookie in header

I’ve got a problem with the Action I’m building. With Postman everything works but when I move it over to an action I cant seem to get the browser cookie across different routes. so it logs in fine in terms of my Python code and user logic internally but fails when calling other routes. I’ve checked the request header. Postman is sending the cookie in the header but ChatGPT Action isnt.,

Any ideas please or any more info you need? If it helps. Im using the OAuth with default (POST) request in the config for the action.