Need client/peer certificate on browser requests with self signed certificate - node.js

Question

I am trying to create a web server where I can get the certificate from the client/peer as I need to read the SAN and Subject fields. The CA and localhost certificates have been generated using mkcert (I also used openssl) where it adds the CA.crt to the browser and system ca-certificate bundle.
When I start node NODE_TLS_REJECT_UNAUTHORIZED='0' node index.js it immediately gives an authorizationError: SELF_SIGNED_CERT_IN_CHAIN.
Using Chrome when I naviate to the site it reports:
This site can’t provide a secure connectionlocalhost didn’t accept your login certificate, or one may not have been provided.
Try contacting the system admin.
ERR_BAD_SSL_CLIENT_AUTH_CERT
Not sure where I'm going wrong. Any help appreciated!
const fs = require("fs");
const key = fs.readFileSync("./localhost-key.pem");
const cert = fs.readFileSync('./localhost.pem');
const express = require("express");
const app = express();
const router = express.Router();
app.get("/", (req, res, next) => {
const tlsSock = req.socket;
console.log(tlsSock.authorized)
console.log(tlsSock.authorizedError)
console.log(tlsSock.getCertificate());
res.status(200).send("Hello world!");
});
const https = require("https");
const server = https.createServer(
{
key,
cert,
requestCert: true, // Need mTLS so the peer certificate is sent.
},
app
);
var req = https
.request({
url: "https://localhost",
})
.on("error", function (err) {
console.log("err:", err);
})
.on("response", function (res) {
console.log("peerCertificate:", res.socket.getPeerCertificate());
console.log("authorized:", res.socket.authorized);
console.log("authorizationError:", res.socket.authorizationError);
});
req.end();
const port = 3000;
server.listen(port, () => {
console.log(`Server is listening on https://localhost:${port}`);
});