Nginx not passing Authorization header when used as forward proxy

Question

I'm building a chrome extension that integrates with the notion API. Since the notion API blocks requests from browsers, I want to set up a forward proxy as a middleman between my extension and the notion API. For that I am using NGINX and docker but the Authorization header required by the notion API is not being forwarded.

Docker file:

FROM nginx:latest
COPY nginx.conf /etc/nginx/nginx.conf

NGINX config

events {
  worker_connections 1024;
}

http {
  server {
    listen 8080;
    server_name localhost;
    

    location / {

        resolver 8.8.8.8;
        proxy_pass http://api.notion.com/;
        proxy_set_header Host api.notion.com;
        proxy_set_header Authorization $http_authorization;
        proxy_pass_header Authorization;
        proxy_pass_request_headers on;
    }
  }
}

Since the Authorization header is not being passed, even though I am sure I'm passing it in the request, nginx still does not forward it but does forward other headers such as Notion-Version, and so notion returns an unauthorized access response

Is there something wrong with the nginx config file? There isn't much support for nginx when used as a forward proxy