WebSocket connection failing with Nginx in Corteza CRM Online Deployment process?

I am currently attempting to set up the Oprensource Corteza CRM Online setup process following the instructions provided in your documentation. (Links referred)
I managed to proceed with setup and when attempting to start the front end I am able to log in but after login only a blank page is displayed with below mentioned error. It is an issue related to web socket connectivity.
Error encountered: WebSocket connection to ‘ws://localhost:8080/api/websocket’ failed: value @ build.js:1 (Refer to the error screenshot)
I followed the instructions in the documentation that refer to the WebSocket connection failing with Nginx scenario. As suggested in the documentation I enabled Nginx WebSocket proxying as mentioned. (Support Link)
Updated file (located in my environment inside /etc/nginx/ directory), added the following lines to the server configuration section; But currently the nginx.conf does not have a server block as mentioned. The server block is currently available in the default configuration file. The default file is added as an import into the nginx. conf.(Refer to the configuration details added)
Would someone in this forum be able to suggest what other follow-up actions may be required to fix this WebSocket connection failure scenario encountered in Corteza CRM?