Why is passportjs not resetting my cookie

Question

I'm using passport username and password logic to authenticate my users. Whenever I call this route, it's not removing the cookies from the browser

router.post('/logout', function(req, res, next) {
  req.logout();
});

I'm trying to remove the cookie that I store here.

app.use(
  session({
    secret: "mysecret",
    resave: false,
    saveUninitialized: false,
    store: MongoStore.create({
      mongoUrl: process.env.MONGO_URI,
      collectionName: "sessions",
    }),
    cookie: {
      maxAge: 1000 * 60 * 60 * 24,
    },
  })
);