Node express with OpenID connect

I use the this library to use oidc with nodejs

What I need is the following:

1. user login with user password, or have the data already the session cookie. this is calling to my app root route "/"

2. I've registered the application already in the authorization server, the auth server should call to my the app/redirect

3. from the auth server I took the clientId and client secret and put it in the app.

4. When the user logged-in the auth server should call to my application redirect route .

5. From the oidc strategy I need to get the tokenset.claims(); and from it tokenset.id_token , the user token. , in the redirect call

It should be with

response_type: 'code',

https://github.com/auth0/express-openid-connect#getting-started

The problem is the getUser function is called (while debug the application) however I got the userIdentity from req.session.userIdentity which is undefined, any idea what could be wrong here?

We are having the same old implementation which using OIDC and it works for the same auth server and clientid and secret.

  const { auth, requiresAuth } = require('express-openid-connect');
  const session = require('express-session');
  const bodyParser = require('body-parser');
    
    module.exports = async (app) => {
    
      const ClientId = process.env.CI;
      const ClientSecret = process.env.CS;
      const URL = process.env.S_URL;
    
      app.use(session({
         name: 'bat-auth',
         secret: 'cookie-secret',
      }));

      app.use(bodyParser.json());
      app.use(bodyParser.urlencoded({ extended: true }));
    
      app.use(auth({
          clientSecret: ClientSecret,
          issuerBaseURL: `${URL}`,
          clientID: ClientId,
          baseURL: process.env.REDT_URL,
          redirectUriPath: '/redirect',  //my app redirect route
          authorizationParams: {
           response_type: 'code',
           response_mode: 'form_post',
           scope: 'openid',
          },
        async handleCallback(req, res, next) {
           req.session.openidTokens = req.openidTokens;
           console.log('---req.openidTokens', req.openidTokens);
           req.session.userIdentity = req.openidTokens.claims();
          next();
        },
        async getUser(req) {
           return req.session.userIdentity;
        },
      }));

  app.get('/', (req, res) => {
    const tokenSet = req.openid.makeTokenSet(req.session.openidTokens);
    console.log(`tokenset root: ${tokenSet}`);

    res.send(req.isAuthenticated() ? 'Logged in' : 'Logged out');
  });
  app.get('/redirect', async (req, res) => {
    const tokenSet = req.openid.makeTokenSet(req.session.openidTokens);
    console.log(`tokenset: ${tokenSet}`);
    console.log('redirect called');
    res.send('redirect called');
  });

I should use form post and at the end, what I need is to get from the tokenset, user.id_token ?

This is what I've, and verified!

1. ClientID from auth server
2. ClientSecret from auth server
3. Config the auth server my app redirect path, which should called me after successful login
4. I've also the aud key

Btw, while debug the application it doesn't stops add handleCallback function , but it stops on the getUser app first, not sure what could be the reason...