How to resolve NodeJS Controller not working

Question

Hello can I please get some help, I am trying working with MVC on NodeJS so I have created a controller and exported it to my routes and that works just fine but then, when I try to hit the route via post man I get a 404 not found can I please get some help on what I maybe doing wrong.

This is my auth controller with only signup wanted to make this work then add the rest

import { userModel } from "../../Models/Users/Users";
import Bcrypt from "bcrypt";
import Formidable from "formidable";
import nodemailer from "nodemailer";
import dotenv from "dotenv";
dotenv.config();

class userAuth {
  SignUp(request, response) {
    const form = new Formidable.IncomingForm();

    try {
      form.parse(request, async (error, fields, files) => {
        const {
          username,
          firstName,
          lastName,
          email,
          password,
          verifiedPassword,
        } = fields;

        if (
          !username ||
          !firstName ||
          !lastName ||
          !email ||
          !password ||
          !verifiedPassword
        ) {
          return response
            .status(400)
            .json({ msg: "All fields have to be entered" });
        }

        if (password.length < 6) {
          return response
            .status(400)
            .json({ msg: "Password has to be at least 6 characters" });
        }

        if (password !== verifiedPassword) {
          return response.status(400).json({ msg: "Password have to match" });
        }

        const isExistingUserName = await userModel.findOne({
          username: username,
        });

        if (isExistingUserName) {
          return response
            .status(400)
            .json({ msg: "Account with this username already exist" });
        }

        const isExistingEmail = await userModel.findOne({ email: email });

        if (isExistingEmail) {
          return response
            .status(400)
            .json({ msg: "Account with this email already exist" });
        }

        const salt = await Bcrypt.genSalt(15);
        const hashedPassword = await Bcrypt.hash(password, salt);
        const newUser = new userModel({
          username,
          firstName,
          lastName,
          email,
          password: hashedPassword,
        });

        const savedUser = await newUser.save();

        const transporter = nodemailer.createTransport({
          service: "SendinBlue",
          auth: {
            user: process.env.sendinBlue__email,
            pass: process.env.sendinBlue__key,
          },
        });

        const mailOptions = {
          from: process.env.sendinBlue__email,
          to: email,
          subject: "Account Activation",
          html: `

                <h1>Activate your account by clicking on link below<h1>
                <a href="http://localhost:5000/account-activation/${savedUser._id}" target="_blank">Account activation</a>
        
        
            `,
        };

        transporter.sendMail(mailOptions, (error, res) => {
          if (error) {
            return response.status(500).json({
              msg: `Network error please try again later, if error continues contact ${process.envsendinBlue__email}`,
            });
          }

          return response.status(201).json({
            msg: `Email has been sent to ${email} for Account activation`,
          });
        });
      });
    } catch (error) {
      return response.status(500).json({
        msg: `Network error please try again later, if error continues contact ${process.envsendinBlue__email}`,
      });
    }
  }
}

export default userAuth;

This code below is how I am calling the controller in routes

import express from "express";
import userAuth from "../../Controller/UserAuthController/UserAuth";
const router = express.Router();

const userAuthController = new userAuth();

router.post("/api/user-signup", (request, response) => {
  userAuthController.SignUp(request, response);
});

export default router;

Can I please get help on why I am getting 404

Picture showing when I was trying to hit the route in the most basic way without sending anything in body with the hope that I will get a response saying All fields have to be entered from server