servermiddleware routes are not recognized in production

const express = require("express");
const { createProxyMiddleware } = require("http-proxy-middleware");

const app = express();

app.use(
  "/api/notifications",
  createProxyMiddleware({
    target: process.env.API_NOTIFICATIONS,
    changeOrigin: true,
  })
);
app.use(
  "/api/customers",
  createProxyMiddleware({
    target: process.env.API_CUSTOMERS,
    changeOrigin: true,
  })
);

module.exports = app;

serverMiddleware: ["~/server-middleware/proxy.js"],