Sure, Here is the detailed flow that I am trying to do. We are using Angular app to show all Sales->Orders. So, we are trying to fetch the orders data using Magento 2 Rest APIs to show in our Angular app. We are getting that CORs error when we are calling rest APIs from the Angular app.
Access to XMLHttpRequest at 'https://yyy.xxxxxxx.com/rest/V1/integration/admin/token' from origin 'http://localhost:4200' has been blocked by CORS policy: Response to preflight request doesn't pass access control check: It does not have HTTP ok status.
As you asked, I have already run the bnsupport tool.