Cors XHR Error: Neither Postman nor Axios requests working. How to get more precise infos about cors errors?

I’m new to web dev and I’m facing a error:
“URLEXAMPLE/:1 Access to XMLHttpRequest at ‘https://DIFFERENTURLEXAMPLE’ from origin ‘https://URLEXAMPLE’ has been blocked by CORS policy: Response to preflight request doesn’t pass access control check: No ‘Access-Control-Allow-Origin’ header is present on the requested resource.”
However I searched and no solution for this error. I would like to know how could I get a more precise info about the error.

My node back end server cors config(I’ve tried already modify the origin to the DIFFERENTURLEXAMPLE with no success):

app.use(
    cors({
        origin: '*',
        methods: ['GET', 'PATCH', 'POST', 'DELETE', 'PUT'],
        credentials: true,
    }),
);
app.use(helmet());

My axios frond end config:

import axios from 'axios';

const axiosInstance = axios.create({
    baseURL: import.meta.env.VITE_BACK_END_URL,
    withCredentials: true
});

axiosInstance.interceptors.response.use(
    (response) => response,
    (error) =>
        Promise.reject(
            (error.response && error.response.data) || 'Something went wrong',
        ),
);


export default axiosInstance;

May you have any suggestion about why this error is happening?