Can't generate issue to GitHub on ios app

Question

I made an express server which generates issue to GitHub with Octokit. This worked if it is on localhost but doesn't work if it is deployed by Vercel.

Express Server

const express = require("express");
var app = express();
const octo = require("octokit");
const Octokit = octo.Octokit;
require("dotenv").config();
const octokit = new Octokit({
    auth: process.env.GITHUB_ACCESS_TOKEN,
});
async function addIssue(title, description) {
    await octokit.request("POST /repos/Jonathan0827/WonsinheungMid/issues", {
        owner: "OWNER",
        repo: "REPO",
        title: title,
        body: title,
        labels: ["bug"],
        headers: {
            "X-GitHub-Api-Version": "2022-11-28",
        },
    });
    console.log("success");
}

app.post("/report", function (req, res) {
    res.send(req.query);
    addIssue(req.query.title, req.query.desc);
});

app.listen(3000);

iOS App

struct params: Encodable {
    let title: String
    let desc: String
}
func generateIssue(title: String, description: String) {
    let issue = params(title: title, desc: description)
    AF.request("URL",
               method: .post,
               parameters: issue,
               encoder: JSONParameterEncoder.default).response { response in
        debugPrint(response)
    }
}