Express session not sending cookie to client side when nodejs app is deployed on nginx live server

I have nodejs application cookies working fine on localhost but when i deploy it on nginx live server cookie not set on client side. Please anyone to assist me on this matter. Below is the code am using to set up express session with cookie.

//express-session configurations
const storeOptions = {
  host: process.env.DB_HOST,
  port: process.env.DB_PORT,
  user: process.env.DB_USER,
  password: process.env.DB_PASS,
  database: process.env.DB_NAME,
  clearExpired: true,
}; //db store

const sessionStore = new MySQLStore(storeOptions);
const sessionOptions = {
  key: process.env.SESSION_KEY,
  secret: process.env.SESSION_SECRET,
  resave: false,
  saveUninitialized: false,
  store: sessionStore,
  cookie: {
    maxAge: 1000 * 60 * 60 * 12, //12hours
  },
};

if (app.get("env") === "production") {
  app.set("trust proxy", 1); // trust first proxy
  sessionOptions.cookie.secure = true; // serve secure cookies
}

app.use(session(sessionOptions));

app.use(passport.initialize()); //initialize passport
app.use(passport.session()); //initialize session with passport