How do I generate Basic HTTP RFC2617 Authentication code?

Question

My problem is exactly same as this one.

The fact is, it's answer didn't worked for me. It is still showing "wrong code".

{ message: 'Access denied: Invalid token, wrong code' }

headers are

headers: {
      'Content-Type': 'application/json',
      Authorization: 'Basic bW9oaXRrdW1hcnNpbmdoMTIzNDRAZ21haWwuY29tOjE1NDg3NjY3Njg='
}

Here is the code used

import axios from 'axios';
import base64 from 'base-64';
import utf8 from 'utf8';

import { totp } from 'otplib';


const reqJSON =
{
    github_url: GITHUB_URL,
    contact_email: EMAIL
}
const stringData = JSON.stringify(reqJSON);

const URL = API_URL;
const sharedSecret = reqJSON.contact_email + "SOME_STRING";

totp.options = { digits: 10, algorithm: "sha512", epoch: 0 }

const myTotp = totp.generate(sharedSecret);
const isValid = totp.check(myTotp, sharedSecret);

console.log("Token Info:", { myTotp, isValid });




const authStringUTF = reqJSON.contact_email + ":" + myTotp;
const bytes = utf8.encode(authStringUTF);
const encoded = base64.encode(bytes);

console.log('encoded ->', encoded);



const createReq = async () => {
    try {
        const config = {
            headers: {
                'Content-Type': 'application/json',
                'Authorization': "Basic " + encoded
            }
        };

        console.log("Making req", { URL, reqJSON, config });

        const res = await axios.post(URL, stringData, config);
        console.log(res.data);
    }
    catch (err) {
        console.error(err.response.data);
    }
};

createReq();

EDIT - Added current code for generating Basic HTTP RFC2617 Authentication Code

Thanks you so much!