JSON-SERVER cors missing origin 403

Question

So I have this json-server setup in my vue3 project and everything just works fine until this one endpoint /leads throwing me this error:

Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at https://mydomain/leads. (Reason: CORS header ‘Access-Control-Allow-Origin’ missing). Status code: 403.

I'm not sure why because the other endpoint which is /inquiries with the same code, a copy-pasted code is working even without the cors npm package.

But I installed it anyway just to make sure cors is setup for all my enpoints. But I'm still getting the same error.

So I would run the json-server like this:

json-server db.json --watch --middlewares cors.js

Here's my cors.js file:

const jsonServer = require('json-server')
    
// Import the library:
const cors = require('cors')

const server = jsonServer.create()       
        
// Then use it before your routes are set up:
server.use(cors())

module.exports = cors()

Here's both /leads and /inquiries endpoint with the same request headers: